What to do if shampoo and flea drops are not effective? - briefly
If topical treatments fail, consult a veterinarian for a prescription oral medication or a professional flea‑control program, and assess the pet’s environment for hidden infestations that may require thorough cleaning and insecticide application.
What to do if shampoo and flea drops are not effective? - in detail
If the usual flea shampoo and spot‑on treatments do not eliminate the infestation, begin by confirming proper application. Verify that the product is intended for the pet’s species, age, and weight, and that the dosage matches the label instructions. Ensure the shampoo remains on the coat for the recommended contact time and that the spot‑on solution is applied to a clean, dry area of skin at the base of the neck.
Next, assess the possibility of resistance. Fleas can develop tolerance to common chemicals, especially when the same product is used repeatedly. In such cases, rotate to a different active ingredient, such as a product containing nitenpyram, spinosad, or a combination of pyriproxyfen and methoprene. Oral medications—e.g., afoxolaner, fluralaner, or sarolaner—provide systemic control and often overcome topical resistance.
Environmental management is essential. Wash all bedding, blankets, and removable fabrics in hot water (≥ 60 °C) and dry on high heat. Vacuum carpets, upholstery, and cracks in flooring daily for at least two weeks; discard the vacuum bag or empty canister immediately. Apply a residual insecticide spray or fogger to indoor spaces, following the label’s safety precautions. Treat outdoor resting areas, such as dog houses or kennels, with an appropriate outdoor flea control product.
Consider mechanical removal. Use a fine‑toothed flea comb on the pet’s coat daily for several days, focusing on the neck, tail base, and underbelly. Collect and dispose of any fleas observed. Regular grooming with a flea‑combing brush can reduce the population while awaiting chemical treatment to take effect.
If infestations persist after these measures, schedule a veterinary examination. The veterinarian may prescribe a prescription‑strength topical (e.g., selamectin) or an injectable formulation (e.g., imidacloprid‑moxidectin). Blood tests can rule out underlying conditions that impair the pet’s immune response, such as hypothyroidism or skin infections, which can exacerbate flea survival.
Finally, monitor the situation. Record the number of fleas seen each day, noting any changes after each intervention. Continued observation for at least four weeks ensures that the life cycle—egg, larva, pupa, adult—is fully interrupted, preventing re‑infestation.