I used this product on my 4 Jacks for the first time & they had no reaction to it at all! The dogs chewed it up in their meal quite freely! They stopped scratching after two days it was administered! Two weeks later I have found them scratching again!

I have been using this on my dog for around two years as previous product no longer was working.
Very happy with it, keeps the dog free of fleas. Never an issue while he is on it.
But.. the tablet is large and he certainly would never take it. The smell of it is revolting, smells like insecticide to me.
I do worry what it is doing to him if it smells so bad. But he suffers terrible allergies from flea bites and ends up with a mange infection. So I have to prevent fleabites for him at all costs.
Nonetheless if I crush it and put it with canned tuna he takes it then.

My two cats had been suffering from fleas for the last 3 months. I had tried multiple different brands/products, flea bombed the house multiple times, steam cleaned, vacuumed daily, washed clothing/linen/cat beds with no improvement what so ever. It was so bad that I was also being bitten daily by the fleas!
I spoke to my local vet and she recommended trying Comfortis tablets.
After 1 hour of giving the tablets to my cats they became very irritated and itchy (this is normal). Just days later and I could not be happier! No more fleas :D :D :D and I am no longer covered in flea bites! Can't recommend this product high enough! Thank you!

After taking comfortis, my cat get really ill.
She doesn't want to eat or drink. After 4 days she still doesn't want to eat anything. The fed count find nothing wrong. But after 1 week she is still ill, and she got pancreatitis. I don't know if she gonna make it. Everyday I have to go to the fed voor medication.

I got comfortis from our humane society. They recommended it highly. I tried several disguises after the cats at first refused the tablets, but to no avail. I even ground one up and mixed it with delicious lamb aspic, and still they wouldn't eat it. If I knew how to administer the stuff, the review might be better.

I gave each of my 3 dogs their first Comfortis about 2 weeks ago and already the results are wearing off! For $100 per 6 month dose it was not worth it. There are adult live flea's on them which leads me to believe that it's not helping with breaking the life cycle.

I have 2 adult cats and I used for many years Frontline and Advocate, which in the past 2 years didn't work at all.
I discovered recently the Comfortis and because my cats are MainCoon of 6 kg and 7.5 kg I had to buy the green box, but I wanted to try first 1/2 tablet to each cat and just half an hour latter I have notice that the cats started being agitated. The whole day they were agitated but the next day, they were so happy, running around and playing like I haven't seen them in the long time.
It's been nearly 3 months since I give them just half tablet and my cats didn't have any fleas.
People, I am so excited, this product really works on my cats!
Excellent product, highly recommanded!

I had 2 14 month old cats brothers who were very close. I thought this product was great after using it for 3 months with my 2 cats. It was always a battle to get one of my cats to take it it was as if he knew it made him feel ill. I continued with it knowing it worked. I gave them both a tablet on the same day, an hour later one of my cats got up after a rest, had a vomit and collapsed and was dead I rushed him to the vet and they couldn't save him. I can't find any other explanation for a sudden death like this. Fortunately we still have one cat I will never ever give him Comfortis again. I just wish I had read these reviews before.

My dog had a very bad flea infestation that was literally driving him crazy, he was miserable. After trying other products like spot on and washing in flea shampoo I was desperate to get him some relief. I decided to try Comfortis and given some of these reviews was slightly nervous but was very careful to follow all the instructions and it was true to its word. After 30 minutes he was calmer and within 4 hours or so the fleas were gone. He did seem to be lethargic for a few hours but that could have been exhaustion from several days of extreme discomfort. I gave him the tablet about 2pm and by the next morning he was his normal happy self and flea free was such a relief.

My mom gave her 8. yes 8 cats this medication last night and 3 threw up the meds and 1 was found dead this morning! No prior health issues or problems, healthy and happy cat that is now dead and my mom is going through guilt over trying to do the right thing and trusting this VET RECOMMENDED medication! After researching, this has been happening for YEARS with this medication! Ridiculous excuse for medication. negatively affected literally 50% of her cats and killed one of them! This needs to be taken Off the shelf!!!

Gave one dose to my 2 year old lab x husky as recommended by local vet. Worked great on fleas, killed them all and almost killed my dog as well!!!!!!!!!!!!!!!
Don't play russian roulette with this poison.