Comfortis for cats: Why are fleas still on them after a week?

Question

Our 2 (4 yr old) cats have fleas. We took them to our vet & they gave us Comfortis for them. We saw a LOT of dead fleas a couple hours later - but now it’s been a week & am still finding live fleas on them. Is it working? Pet's info: Cat | Mixed Breed | Male | neutered | 4 years and 2 months old | 10 lbs

Sarah Derksen, DVM · Accepted Answer

Hi. The issue is that most likely all stages of the fleas arent being killed at the same time, therefore they keep coming. The other possibility is they are in the environment or on other peta and being reinfected. For a flea infestation you have to treat the pet and the environment by a professional company at the same time! Where there is a live flea, there are a TON of eggs! Good luck

Comfortis for cats: Why are fleas still on them after a week?

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