What to do if fleas on a cat are not being eliminated? - briefly
Consult a veterinarian for a prescription flea treatment and follow the recommended dosing schedule, applying the product repeatedly as instructed. Simultaneously, wash all bedding, vacuum the house thoroughly, and use an environmental flea spray or fogger to eliminate any remaining insects.
What to do if fleas on a cat are not being eliminated? - in detail
When flea treatments fail, first verify that the problem is truly a flea infestation. Examine the cat’s coat for live insects, flea dirt (small black specks), or signs of irritation. If the cat shows no visible evidence, consider other skin conditions and schedule a veterinary assessment.
A veterinarian can confirm the diagnosis and identify possible resistance to common flea products. Prescription‑only options such as selamectin, fluralaner, or a combination of imidacloprid and moxidectin may be necessary. Follow the prescribed dosing schedule precisely; missed doses can allow the parasite population to rebound.
Environmental control is essential. Wash all bedding, blankets, and grooming tools in hot water (≥ 130 °F) and dry on high heat. Vacuum carpets, rugs, and upholstery thoroughly, then discard the vacuum bag or clean the canister immediately. Apply a flea‑killing spray or fogger to the home, focusing on areas where the cat spends time. Repeat treatment according to product instructions, typically after 7–10 days, to target emerging adult fleas.
Treat any other animals in the household simultaneously. Even if they appear healthy, they can harbor fleas and re‑infest the cat. Use the same class of medication for all pets, unless a specific contraindication exists.
If the infestation persists after three weeks of coordinated treatment, return to the veterinarian for a reassessment. Possible causes include drug resistance, incorrect application, or a hidden source of fleas such as an untreated outdoor area or a wildlife host. The veterinarian may recommend a different class of insecticide, a combination therapy, or a longer treatment course.
Maintain a regular preventive regimen once the infestation is cleared. Monthly topical or oral flea preventatives, combined with routine cleaning, keep the cat and the environment free from re‑infestation.