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At a Glance
Comfortis is safe for use in dogs and cats
Prevents flea infestations for a full 30 days
Kills fleas within 30 minutes
This product requires a prescription.


Comfortis is the first beef-flavored chewable that both kills fleas and prevents infestations in your dog or cat for a full 30 days. Comfortis is safe for puppies and kittens as young as 14 weeks. [+]

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  • Other Customers Also Bought for their Pet

    • Kills fleas and ticks within 12 hours
    • Kills flea eggs, pupae, larvae, and adults for 30 days
    • Kills and protects against mosquitoes, which are the primary cause of heartworm
    • Protect your dog from a variety of disease carrying ticks
    • Kills fleas, and controls American Dog Tick infestations
    • Once a month spot on to prevent internal and external parasites including heartworm
    • Treats and controls ear mites and sarcoptic mange
    • Water-based, pH balanced, and non-irritating
    • Guaranteed not to rinse out flea and tick medicine
    • Lathers up quick and rinses out easily
    • Fresh, clean fragrance

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Rated 5 out of 5 by 249 reviewers.
Rated 3 out of 5 by It works well but tough to get them to eat it This product saved a feral cat i take care of.He had a bad flea allergy.Only problem is the pill is massive and no matter what food i put it in he knows it right away and 2 licks and walks away.After the 1st time it was almost impossible.Crushed it up as fine as possible and put it in all his favorite wet food.Taste must be awful.Too big 07/27/2016
Rated 5 out of 5 by much beter than the oils I have been using Comfortis for years on all my dogs. I put it in their food. No adverse reaction. no messy oily fur like other products. 07/08/2016
Rated 5 out of 5 by I highly recommend Comfortis This is the easiest flea prevention medicine I've used for my cat. I just crush it up and mix it with a little wet food. No struggling to hold my cat still, no mess, no worrying about whether or not the medicine is on here he can lick it and get sick like with topical treatments. 07/03/2016
Rated 5 out of 5 by Super easy to use, no mess and it works! Having tried numerous products we find Comfortis Brown to be great. We have a 90 lb. 2 year old female weimaraner who has a delicate stomach and sensitive skin. Other topical products have given her rashes and other ingestibles have caused her to vomit. With Comfortis Brown she has no side effects and the product works. We live in Southern California so we usually start flea prevention meds by the middle of April. This year we fell behind and found she had a few fleas on her. After giving her one chewable following her evening meal (she thinks its a treat and loves them!) the next morning the fleas were gone and we have not seen a flea since. We are very active and outdoors regularly with regular interaction with other dogs. The fleas still stay away. 05/26/2016
Rated 1 out of 5 by Good for dogs but not finicky cats I just wish this was available as a small pill I could successfully get down my cats throat . I gave up trying and gave comfortis to my neighbor for her dog. 05/03/2016
Rated 5 out of 5 by A Miracle! Our little five month old Molly kitty came to us, horribly infested with fleas. She is a long hair, part Persian. NOTHING was helping, including bathing and combing, until we took her to our local Vet and she was given Comfortis. The fleas began to literally fall off of Molly, within minutes! By the time we arrived home, just a few minutes later, Molly's blanket was covered in fleas...100's! NOT a typo! By that very evening, Molly was a different little girl...happier than she had been since we brought her home. THANK YOU, Comfortis!! From a family of believers!! :) 01/30/2016
Rated 4 out of 5 by Good product but a little pricey Good product but my dog does not seem to like the taste now. I've used it in the past and he's eaten it no problem. Lately he's not interested. Did you change the taste? 01/11/2016
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