When can a flea collar be put on a kitten: recommendations?

«Understanding the Dangers of Flea Collars for Kittens»

«Why Young Kittens Are Vulnerable»

«Immature Immune Systems»

Kittens under eight weeks of age possess underdeveloped immune defenses, limiting their capacity to tolerate chemical preventatives. Their skin barrier remains thin, and systemic absorption of active ingredients is higher, increasing the risk of toxicity. Consequently, most manufacturers advise against applying flea collars until the animal reaches a minimum of 12 weeks and has completed the initial vaccination series.

Key considerations for early flea control:

Vaccination status – ensure core vaccines (FVRCP, rabies) are administered and the immune response is confirmed.
Weight threshold – collars are typically rated for cats weighing at least 2 kg; lighter kittens may experience irritation or overdosing.
Product formulation – choose collars labeled “kitten‑safe” or specifically tested for use on animals younger than six months; avoid adult‑strength versions.
Monitoring – after placement, observe the kitten for signs of dermatitis, lethargy, or gastrointestinal upset; remove the collar immediately if adverse reactions appear.

If immediate protection is required before the recommended age, opt for veterinarian‑approved spot‑on treatments or oral medications formulated for kittens, as these allow precise dosing and reduced systemic exposure. Once the kitten attains the appropriate age, weight, and immunization milestones, a properly sized flea collar can be introduced as part of a comprehensive ectoparasite management plan.

«Sensitivity to Chemicals»

Chemical sensitivity is a primary factor when deciding the appropriate moment to attach a flea collar to a young cat. Most manufacturers set a minimum age of twelve weeks because immature skin and respiratory systems are more prone to adverse reactions. The collar’s active ingredients—typically pyrethroids, imidacloprid, or pyriproxyfen—can penetrate the epidermis and be inhaled, triggering dermatitis, sneezing, or respiratory distress in susceptible kittens.

Veterinarians recommend a preliminary assessment before any collar is applied. Observe the kitten for the following indicators of intolerance:

Redness or swelling around the neck area
Excessive scratching or licking of the collar site
Nasal discharge, coughing, or labored breathing
Unusual lethargy or loss of appetite

If any symptom appears within 24 hours of placement, remove the collar immediately and seek professional advice. Conducting a patch test can reduce risk: place a small segment of the collar material on a shaved area of the back for a few minutes, monitor for a reaction, and only proceed if the skin remains normal.

Weight also influences safety. Kittens under 2 kg may experience higher relative exposure to the chemicals, increasing the likelihood of irritation. For animals below this threshold, alternative flea control methods—such as topical spot‑on products formulated for low‑weight cats or oral medications approved for young felines—provide comparable protection without the collar’s chemical load.

Finally, always verify that the collar’s label specifies suitability for kittens. Products lacking explicit age or weight guidelines should be excluded from use. Regular veterinary check‑ups ensure that any emerging sensitivity is detected early and that the chosen flea prevention strategy remains appropriate for the kitten’s developmental stage.

«Risk of Ingestion»

A flea collar applied to a young cat carries a distinct hazard: the kitten may chew or swallow the collar or its components. Ingestion can lead to acute toxicity, gastrointestinal irritation, or, with certain active ingredients, systemic effects such as tremors or liver stress. The risk is highest in kittens under four months, because they explore objects with their mouths and lack the coordination to keep a collar securely in place.

To minimize the danger, follow these precise actions:

Choose a collar specifically labeled for kittens, with a weight limit that matches the animal’s size.
Verify that the product contains only low‑toxicity active agents, such as imidacloprid or selamectin, and that the concentration complies with veterinary guidelines for young animals.
Fit the collar loosely enough to allow two fingers to slide beneath it, preventing choking while discouraging chewing.
Inspect the collar daily for signs of wear, fraying, or loose parts that a kitten could detach.
Remove the collar during unsupervised periods, especially when the kitten is alone or in a confined space.
Replace the collar promptly if any portion is missing or if the kitten shows signs of oral discomfort, excessive licking, or vomiting.

If ingestion is suspected, seek veterinary care immediately. Prompt treatment may involve induced vomiting, activated charcoal, and supportive therapy to prevent systemic toxicity. Regular monitoring after any incident ensures the kitten recovers without lasting effects.

«Optimal Age for Flea Collar Application»

«Manufacturer Recommendations and Age Limits»

Manufacturers set specific minimum ages for applying flea collars to young cats. The age limit is usually expressed in weeks or months and is linked to the kitten’s physiological development and skin sensitivity.

Most brands require kittens to be at least 8 weeks old before a collar can be placed.
Some products list a minimum age of 10 weeks, especially those containing higher concentrations of active ingredients.
A few low‑dose formulations are approved for use on kittens as young as 6 weeks, provided the animal meets the weight requirement.

Weight thresholds accompany age limits. Common specifications include a minimum weight of 2 lb (0.9 kg) for 8‑week recommendations and 3 lb (1.4 kg) for 10‑week recommendations. Exceeding the weight minimum does not override the age restriction; both criteria must be satisfied.

Manufacturer instructions also dictate collar size relative to the kitten’s neck circumference. The collar should be adjustable but not so loose that it slides more than one finger’s width above the skin.

Compliance with label directions prevents adverse reactions such as skin irritation or systemic toxicity. When a kitten meets both the age and weight criteria, the collar can be fastened securely, and the animal should be monitored for any signs of discomfort during the first 24 hours.

«Veterinarian's Advice on Timing»

Veterinarians stress that flea collars must be applied only after a kitten reaches a developmental stage that can tolerate the chemical exposure. The primary factors are age, weight, and overall health status.

Kittens younger than eight weeks generally lack the metabolic capacity to process the active ingredients safely. Even at eight weeks, a minimum body weight of 2 kg is required to ensure the collar’s dosage remains within a therapeutic range. Animals with skin conditions, respiratory issues, or compromised immune systems should be evaluated individually before collar use.

Key timing guidelines:

Minimum age: 8 weeks (approximately two months).
Minimum weight: 2 kg (4.4 lb).
No recent illness or ongoing medication that could interact with the collar’s ingredients.
A full health check by a veterinarian before first application.

Safety measures include inspecting the collar for damage, ensuring a snug but not tight fit around the neck, and monitoring the kitten for signs of irritation or behavioral changes during the first 24 hours. If adverse reactions appear, remove the collar immediately and consult a veterinary professional. Regular veterinary assessments help maintain effective flea control while protecting the kitten’s health.

«Alternative Flea Prevention for Young Kittens»

«Topical Treatments»

Topical flea treatments provide an alternative to collars for young cats. Products labelled “kitten‑safe” are formulated for animals as young as four weeks, but manufacturers usually set a minimum weight of 2 lb (≈ 0.9 kg). Apply the medication to a single spot on the back of the neck, avoiding the spine and any open wounds. The solution spreads across the skin through natural oil production, offering protection for 30 days in most cases.

When a collar is considered, the same age and weight limits apply. A collar placed on a kitten younger than the recommended threshold can cause skin irritation, respiratory distress, or accidental ingestion. Therefore, topical options are often preferred until the kitten reaches the required size.

Key points for selecting a topical product:

Verify the label specifies use on kittens and lists the minimum age/weight.
Choose a formulation without pyrethrins if the kitten has a history of sensitivity.
Follow the exact dosage; overdosing does not increase efficacy and raises toxicity risk.
Monitor the application site daily for redness, hair loss, or excessive licking.

If a flea collar becomes appropriate, ensure it is a “kitten‑compatible” model, remove it if any adverse reaction appears, and continue regular veterinary check‑ups to confirm ongoing safety.

«Oral Medications»

Oral flea treatments are often the first line of defense for kittens before a collar is considered. Most products are labeled for use at four weeks of age or a minimum weight of 0.5 kg; younger or smaller kittens may experience adverse reactions. A veterinarian should confirm that the kitten’s health status permits systemic medication, especially if the animal has pre‑existing conditions or is receiving other drugs.

Key considerations for oral options:

Age and weight limits – follow manufacturer specifications; typical minimum is 4 weeks and 0.5 kg.
Active ingredient – common classes include nitenpyram, lufenuron, and spinosad; each has a distinct mode of action and duration.
Dosage frequency – some products require monthly administration, others are a single dose lasting up to 12 weeks.
Safety profile – monitor for vomiting, diarrhea, or lethargy after dosing; discontinue and seek veterinary advice if symptoms appear.
Interaction with collars – avoid simultaneous use of oral and collar products containing the same insecticide to prevent overdose.

If oral medication is started at the earliest eligible age, it can provide immediate protection while the kitten matures enough for a flea collar. Once the kitten reaches the collar’s minimum age and weight, transitioning to a collar is permissible, provided a washout period of at least 48 hours is observed to clear residual oral insecticide. This approach minimizes the risk of overlapping toxicity and ensures continuous flea control.

«Environmental Control Measures»

Effective flea management for young cats relies on more than a single product; the surrounding environment must be addressed to minimize re‑infestation. Before attaching a flea collar to a kitten, the household should be treated to reduce the risk of immediate exposure.

First, remove or wash all bedding, blankets, and soft toys in hot water. Dry them on a high‑heat setting or replace items that cannot be laundered. Second, vacuum carpets, upholstery, and cracks in flooring thoroughly; discard the vacuum bag or clean the canister immediately after use. Third, treat the entire residence with a veterinarian‑approved indoor spray or fogger that targets all life stages of fleas, following label instructions for dosage and ventilation. Fourth, limit the kitten’s access to outdoor areas where fleas are prevalent until the collar is safely applied and the environment has been cleared.

Key environmental control steps:

Clean and disinfect litter boxes weekly; replace litter if heavily soiled.
Trim grass and weeds around the home’s perimeter to reduce flea habitats.
Keep pet sleeping areas off the floor; use washable covers that can be laundered regularly.
Seal gaps under doors and windows to prevent entry of stray animals that may carry fleas.

After these measures are completed, a flea collar designed for kittens older than eight weeks can be placed according to the product’s age and weight specifications. Monitoring the kitten for skin irritation and ensuring the collar remains snug but not tight completes the integrated approach.

«Types of Flea Collars and Their Efficacy»

«Insecticide-Based Collars»

«Pyrethroids and Their Risks»

Pyrethroids are synthetic insecticides frequently incorporated into flea collars for cats. Their mode of action involves disrupting the nervous system of fleas, leading to rapid paralysis and death. In kittens, the blood‑brain barrier and metabolic pathways are not fully matured, which increases susceptibility to neurotoxic effects.

Key risks associated with pyrethroid exposure in young cats include:

Skin irritation or dermatitis at the collar site.
Respiratory distress caused by inhalation of volatilized compounds.
Neurological symptoms such as tremors, ataxia, or seizures.
Potential systemic toxicity if the collar is chewed or ingested.

Because kittens under eight weeks lack adequate detoxification capacity, most veterinary guidelines advise against using pyrethroid‑based collars until this age threshold is reached. If a collar is considered for a kitten older than eight weeks, the following precautions are essential:

Verify that the product label explicitly states safety for kittens of the specific age and weight.
Apply the collar according to manufacturer instructions, ensuring a snug but not constricting fit.
Monitor the animal for any signs of irritation or abnormal behavior during the first 24 hours.
Remove the collar immediately if adverse reactions appear and seek veterinary care.

Alternatives such as topical spot‑on treatments or oral medications formulated for kittens provide effective flea control without the heightened pyrethroid risk. Selecting a method that matches the kitten’s developmental stage minimizes health hazards while maintaining parasite protection.

«Organophosphates: Aversion and Dangers»

Organophosphate compounds are common active ingredients in many flea collars marketed for kittens. These chemicals inhibit acetylcholinesterase, causing accumulation of acetylcholine in synapses and leading to overstimulation of the nervous system. Symptoms of toxicity in young cats include drooling, tremors, seizures, and respiratory distress. Early detection is critical because rapid progression can result in fatal outcomes.

Kittens display natural aversion to strong odors and irritants. When a collar containing organophosphates is applied too early, the animal often attempts to remove it, increasing stress and the likelihood of skin irritation. Persistent scratching or rubbing may create micro‑abrasions that facilitate systemic absorption of the toxin.

Recommendations to minimize risk:

Wait until the kitten is at least 8 weeks old and has completed the initial vaccination series.
Choose collars labeled specifically for kittens, with organophosphate concentrations below 0.05 % and a safety release mechanism.
Perform a 24‑hour observation period after placement; discontinue use if the kitten shows signs of discomfort, excessive grooming, or neurological abnormalities.
Consult a veterinarian before introducing any chemically treated device, especially if the animal has a history of respiratory or dermatological conditions.

Understanding the pharmacological profile of organophosphates and respecting the developmental sensitivity of young cats reduces the probability of adverse reactions while maintaining effective ectoparasite control.

«Natural Repellent Collars»

«Essential Oils: Efficacy and Potential Irritation»

Essential oils are sometimes marketed as natural flea deterrents, yet scientific evidence supporting their efficacy against cat fleas is limited. Laboratory studies show that certain compounds, such as peppermint, eucalyptus, and citronella, possess insect‑repellent properties, but concentrations required to affect adult fleas often exceed safe exposure levels for felines. Cats lack the enzyme glucuronyl transferase, which impairs their ability to metabolize many terpenes; exposure can lead to hepatic toxicity, respiratory distress, or dermatologic inflammation.

When considering a flea collar for a kitten, the following points must be evaluated regarding essential‑oil formulations:

Verify that the collar’s active ingredients are explicitly approved for use on cats under eight weeks of age.
Confirm that the oil concentration remains below the threshold associated with mucosal or skin irritation in felines.
Ensure the product label lists a clear withdrawal period before the kitten reaches maturity, allowing any residual oil to dissipate.
Prefer collars that rely on synthetic insecticides with established safety profiles over those containing volatile botanical extracts.

If a caregiver opts for an essential‑oil collar, monitor the kitten for signs of irritation, including redness, excessive grooming, sneezing, or lethargy. Immediate removal of the collar and veterinary consultation are warranted at the first indication of adverse reaction. For young cats, the safest approach is to use collars specifically formulated for kittens, avoiding any product that lists essential oils as the primary active component.

«Combination Collars: Pros and Cons»

Combination collars integrate flea, tick, and sometimes heartworm protectants into a single band that releases active ingredients through the skin. Manufacturers usually label them for use on kittens older than eight weeks and weighing at least 2 lb (0.9 kg). The age threshold reflects the time needed for the kitten’s skin to tolerate the chemicals without irritation.

Advantages

Continuous protection for up to five months reduces the need for monthly topical applications.
Single device eliminates the risk of missing a dose, which can occur with separate products.
Water‑resistant design maintains efficacy during bathing or rain.
Low‑maintenance format suits owners who travel or have limited time for grooming.

Disadvantages

Fixed dosage may be excessive for very small kittens, increasing the chance of adverse skin reactions.
Ingredients in some collars are not approved for use in very young animals, limiting brand options.
Removal or replacement requires careful handling to avoid accidental ingestion of the collar material.
Resistance development in fleas or ticks can occur if the same active ingredient is used repeatedly.

For kittens that meet the minimum age and weight criteria, a combination collar can be an effective part of an integrated parasite‑control program. If the kitten is younger than eight weeks, under the weight limit, or shows signs of skin sensitivity, a veterinarian‑prescribed topical or oral product should be used until the collar becomes appropriate. Regular veterinary assessment ensures the chosen method remains safe and effective throughout the kitten’s development.

«Proper Application and Monitoring»

«Correct Fit and Sizing»

A flea collar must match the kitten’s neck circumference and weight to work safely and effectively.

Measure the kitten’s neck with a flexible tape, adding 1‑2 cm to allow a snug but movable fit. The collar’s label should indicate a weight range; select a product that includes the kitten’s current weight.

Place the collar around the neck, ensuring it slides freely one finger’s width between collar and skin.
Secure the buckle or clasp, then double‑check the gap by moving the collar; it should not rotate completely around the neck.
Observe the kitten for a few minutes; signs of discomfort, excessive scratching, or breathing difficulty indicate an incorrect size.

If the collar is too loose, replace it with a smaller size or add an adjustable spacer. If it is too tight, loosen or choose a larger collar before re‑applying. Regularly re‑measure as the kitten grows, adjusting the collar each month to maintain the proper fit.

«Signs of Adverse Reactions»

«Skin Irritation and Hair Loss»

Applying a flea collar to a kitten carries a risk of dermatological reactions. The most common manifestations are localized redness, swelling, and loss of fur around the neck and adjacent areas. Irritation typically appears within 24‑48 hours of collar placement and may progress to crusting or secondary bacterial infection if left untreated.

Key indicators of an adverse skin response include:

Persistent itching or scratching of the collar region.
Visible reddening or inflammation that does not subside after a few hours.
Patches of hair thinning or bald spots directly under the collar.
Presence of scabs, oozing, or foul odor, suggesting infection.

If any of these signs are observed, remove the collar immediately and rinse the area with mild, veterinary‑approved cleanser. Monitor the kitten for 12‑24 hours; if symptoms persist, consult a veterinarian for anti‑inflammatory treatment or alternative ectoparasite control.

Preventive measures reduce the likelihood of irritation:

Select a collar specifically labeled for kittens, with a lower concentration of active ingredients and a weight appropriate for a small animal.
Ensure the collar fits snugly but allows two fingers to slide between the collar and the kitten’s skin, preventing excessive pressure.
Conduct a 48‑hour observation period after initial placement; if no reaction occurs, continue use according to the product’s schedule.
Rotate the collar off for at least one week after each treatment cycle to give the skin a recovery period.

Understanding the relationship between flea collars and dermatological health enables owners to safeguard kittens from unnecessary discomfort while maintaining effective parasite protection.

«Behavioral Changes and Lethargy»

Applying a flea collar to a kitten requires careful monitoring for sudden changes in behavior and reduced activity. These symptoms may signal an adverse reaction to the collar’s chemicals or an underlying health issue that the collar could exacerbate.

Aggressive or fearful demeanor, including sudden swatting, hiding, or vocalization.
Decreased playfulness, reluctance to eat, or prolonged sleeping beyond normal kitten patterns.
Unexplained limpness, trembling, or difficulty moving.

If any of these signs appear within the first 24‑48 hours after fitting the collar, remove the device immediately and consult a veterinarian. The removal should be followed by a thorough examination to differentiate between a mild irritation and a more serious toxicity. In the absence of adverse reactions, most experts recommend waiting until the kitten reaches eight weeks of age before attaching a flea collar, ensuring the animal’s immune system and skin barrier are sufficiently mature.

Continual observation for at least a week after installation helps confirm tolerance. Should normal behavior resume and activity levels remain steady, the collar can be considered safe for ongoing use, provided it is checked regularly for wear, proper fit, and signs of irritation.

«Gastrointestinal Upset»

Applying a flea collar to a young cat requires attention to the risk of gastrointestinal disturbance. The collar’s active ingredients can irritate the stomach and intestines if the animal chews or swallows part of the device, leading to vomiting, diarrhea, or loss of appetite.

Typical manifestations of gastrointestinal upset include:

Vomiting shortly after the collar is placed
Soft or watery stools
Reduced food intake
Lethargy combined with abdominal discomfort

Recommendations to minimize these reactions:

Use collars specifically labeled for kittens, usually approved for animals older than eight weeks and weighing at least two pounds.
Ensure the collar fits snugly but allows two fingers to slide underneath; a loose collar encourages chewing.
Monitor the kitten for the first 24 hours, observing feeding behavior and stool consistency.
If any signs of upset appear, remove the collar immediately, provide fresh water, and offer a bland diet such as boiled chicken and rice.
Contact a veterinarian if vomiting persists beyond a few hours, if blood appears in vomit or stool, or if the kitten shows signs of dehydration.

Preventive measures include keeping the collar out of reach when the kitten is unsupervised, selecting products with low‑odor formulations, and avoiding simultaneous administration of other oral medications that could exacerbate stomach irritation.

«When to Remove the Collar»

A flea collar should stay on a kitten only as long as it continues to provide protection without causing harm. Remove it promptly when any of the following conditions appear:

The kitten shows signs of irritation: redness, swelling, hair loss, or persistent scratching at the collar area.
The collar becomes loose or the fastening mechanism fails, allowing it to slip off or tighten excessively.
The kitten reaches the weight limit specified by the manufacturer, typically around 2 kg (4.5 lb).
The recommended duration on the product label expires, often 30 days for young animals.

General guidelines for timing:

Begin using a collar only after the kitten is at least 8 weeks old and has completed its initial series of vaccinations.
Monitor the collar daily for the first week; if no adverse reactions occur, continue use according to the label’s schedule.
At the end of the prescribed period, discard the collar and replace it with an age‑appropriate alternative, such as a topical treatment or oral medication.

Before removal, inspect the skin beneath the collar for lingering irritation. Clean the area gently with a mild, unscented cleanser if needed. Document any reactions and consult a veterinarian if symptoms persist after the collar is taken off.

«Consulting Your Veterinarian»

«Importance of Professional Guidance»

Professional advice determines the safe age for applying a flea collar to a young cat. Veterinarians assess weight, health status, and previous parasite treatments before recommending a specific product. Their expertise prevents exposure to toxic ingredients that can cause skin irritation, respiratory distress, or systemic poisoning in developing animals.

Key reasons to consult a professional:

Confirmation that the kitten’s weight meets the collar’s minimum requirement.
Verification that no conflicting medications or vaccines have been administered recently.
Selection of a collar formulated for the kitten’s age group, with appropriate dosage.
Guidance on proper placement to avoid choking hazards and ensure continuous contact with the skin.

Without veterinary input, owners risk using adult‑strength collars that exceed safe dosage levels, leading to adverse reactions. A vet can also suggest alternative control methods, such as topical spot‑on treatments or oral preventatives, when a collar is unsuitable.

In summary, expert evaluation provides a tailored, evidence‑based plan that safeguards the kitten’s health while effectively managing flea infestations.

«Tailoring a Flea Prevention Plan»

A flea‑prevention plan for a young cat must reflect age, weight, health condition, and environmental exposure. The collar is the central element only after the kitten reaches a stage where the active ingredients are safe.

Minimum age: most manufacturers authorize use at eight weeks, provided the kitten weighs at least 2 lb (0.9 kg). Earlier application risks skin irritation and systemic absorption.
Weight verification: confirm the kitten meets the lower weight limit; a heavier collar may be required for larger animals.
Health assessment: ensure the kitten is free of dermatological lesions, respiratory issues, or recent antiparasitic treatments that could interact with the collar’s chemicals.
Veterinary endorsement: obtain a professional’s approval before fitting, especially for premature or underweight kittens.

When the collar is appropriate, follow these steps to integrate it into a broader strategy:

Apply the collar snugly around the neck, leaving two fingers’ space for movement.
Combine the collar with a monthly oral or topical adult‑dose product only after the kitten is at least three months old, to avoid overlapping toxicities.
Maintain a clean living area: wash bedding weekly, vacuum carpets, and treat the home environment with a veterinarian‑recommended insecticide.
Schedule regular check‑ups every six weeks during the first six months to monitor for adverse reactions and adjust the regimen as the kitten matures.

Tailoring the plan requires continuous evaluation of the kitten’s growth milestones and any changes in exposure risk. Adjust the collar’s brand, dosage, or supplementary treatments in response to veterinary feedback and observed efficacy.

«Addressing Specific Concerns and Health Conditions»

Flea collars are not universally safe for all kittens. Their suitability depends on age, weight, skin integrity, and underlying medical issues.

Kittens younger than eight weeks generally lack the metabolic capacity to process the chemicals in most collars. Even at eight weeks, a minimum weight of 1 kg is often required; lighter animals risk overdosing. Veterinarians recommend confirming growth milestones before application.

Specific health conditions demand extra caution:

Dermatological disorders – eczema, allergies, or open wounds can become irritated by the collar’s contact surface. Apply only after lesions have healed and a vet has cleared the skin.
Respiratory or hepatic disease – compromised liver function reduces clearance of active ingredients, increasing toxicity risk. Laboratory assessment of liver enzymes should precede use.
Renal insufficiency – impaired kidney function may alter excretion pathways, heightening systemic exposure. Monitoring of renal markers is advisable.
Neurological disorders – seizures or tremors may be exacerbated by certain pyrethroids or organophosphates found in collars. Avoid unless a specialist confirms safety.
Pregnancy or lactation – hormonal changes affect metabolism; veterinary guidance is essential before fitting a collar on a pregnant or nursing queen and her offspring.

When a kitten meets age and weight requirements and shows no contraindicating conditions, follow these steps:

Choose a collar labeled for kittens and verify the dosage matches the animal’s weight range.
Inspect the collar for damage; a compromised seal can release excess chemicals.
Fit the collar snugly but allow two finger widths of movement to prevent choking.
Observe the kitten for 24 hours, watching for signs of irritation, excessive scratching, lethargy, vomiting, or respiratory distress.
Remove the collar immediately if adverse reactions appear and consult a veterinarian.

Veterinary assessment remains the definitive safeguard. Regular health checks ensure that any emerging condition is identified before a flea collar is introduced.