Hartz flea collar made my cat sick

I used Hartz flea collars on all 4 of my cats who are all under a year old. After about an hour of wearing the flea collars my cats began to act different. Usually my cats will eat anything you put in front of them, but all of a sudden they wouldn’t eat any of their treats or chicken I had for them. They were also acting very sluggish and lethargic. I assumed that they may just not be fond of having to wear collars. The next night one of my cats Darwin began crying and I had no idea why. I followed him into the bathroom where I saw him vomiting a weird yellowish green liquid that was sort of frothy and there was also a bit of diarrhea on the floor. I took the collars off each cat after this happened. But, now I’m really not sure what to do and I am not sure if my cat is going to be alright.  Darwin seems more relaxed now, he is laying down in the bathroom. Is there ANYTHING to fix this or am I too late?

12 Replies to “Hartz flea collar made my cat sick”

  1. Oh no!! I’m sorry to hear about that! These collars are so dangerous! I’m almost doe with my schooling to get my vet tech degree, and there was this girl who used this product, and she said the next day she woke up with her cat yelping in pain and she saw that the collar inflamed her neck and the hair was missing and all you saw was her pink skin and flesh. 🙁 (And no the collar wasn’t on to tightly ) its a shame hart’z still makes their products

  2. I put a Harts cooler on my kitty, too. After a few days witnessing her lack of energy and appetite; I’be taken it off her. I feel like the worst pet parent in the world. The only reason I left it on so long; fear that the fleas were eating her alive. Now she is so not feeling well. Any suggestions?

  3. I just put on a hartz flea collar on my 5 month old kitten today , and it made him sick. He went from his normal active playful self to not doing anything, and dug and dug at his neck. He vomited once. I didn’t have it on more than a couple hours before I took it off. He is doing better now it’s off him. Horrible product. Will never get it again.

  4. I put a Hartz flea collar on my 8 year old cat last week. I’ve noticed her acting very differently. She’s crouched up and hid in a dark corner at the end of the hallway, hasn’t eaten, drank water or pottied in several days, she’s lost weight, doesn’t want to be bothered (when normally she’s a very loving baby and wants to be near (on) us all the time). She definitely doesn’t feel good at all!
    I just Googled this and saw all these negative comments about the Hartz products! 😮 I’ve taken the collar off her now, and I’m debating if I should take her to the vet or wait to see if she starts feeling better.

  5. My cat died today. 😭
    I feel like it has something to do with me putting that collar on her last week, because she was fine until then.

  6. Hello, I put a collar on my cat who is 8 yrs old last night and noticed that he has been in the dark closet for roughly 13 hrs now. I just removed it and am praying he will be ok. Is there anything else I can do?

  7. I just taken the collar off my cat tonite and he is displaying all the same symptoms not social not eating not thirsty he threw up a greenish yellowish fluid and it’s because he hasn’t been eating so that’s all he had on his stomach and hasn’t been using restroom either….I hope he will be okay.its 3 am and I go g to try to wash him to see if i can get rest of meds off of fur and skin..I hope he will be okay I feel so sick myself knowing I put this on him!

  8. I put these collars on my cats about a week ago and my orange tabby stopped eating a couple of days ago, stopped playing, laying in weird corners of the house, lethargic, walking with tail lower to floor, refused to venture outside when she normally the first one out the door, I could get her to eat treats but she wasn’t excited about it like she normally was. I’ve been looking online to try and figure out what’s wrong with her and found this forum. I took both the collars off immediately and washed the ones neck who’s been sick. I really hope she’s going to be okay.

    1. There products killed a emotional support animal. They do not care about animals. I will never buy there products ever again. I’m disgusted with them and there products. Then they act like they care about hen they don’t. THEY KILLED MY CAT

  9. My 9 year old started showing the same symptoms as listed on this page after wearing the collar. I took it off a day later and still seems to be very lethargic, sleeping alot and certainly not as social. He is eating and has not vomited which I guess is a good sign. I will wash him very good with Dawn. Hopefully that will get rid of the remaining toxins. I feel just horrible for what I have done to him. 🙁 I pray he gets better soon.

  10. Don’t use these collars. I put a purple-7 month Hartz collar on my 8year old cat and it made him sick. He started acting weird, crying and vomited greenish yellow foam. He was trying to eat grass which is always a sign an animal is sick. Took collar off and he appears to be better after a day. These chemical are to harsh for them and we stick them around their heads. I’ve read a lot of article relating to this. Not sure what to use now. My animals have hated the drops you place on their backs, too. They run when they heard that popping sound of the tube. The though of putting something eatable in their body sounds wrong to me too. Any suggestion on something safe?

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