Hartz Mountain Flea & Tick Drops Reviews

I bought this product because it was on the Walmart shelf and I was trying to save money with a limited budget. I bought it as a preventative measure as I'd been in contact with fleas and wanted to keep my babies safe. I applied it three days ago and today I found horrible open sores and scabs on their necks exactly where I had applied the product, and both have thrown up today. I immediately borrowed some pet shampoo from a friend and washed them tonight. I'm really hoping that it helps them fight this and I am so horrified by what could happen to them, reading other reviews. I'll be taking to the vet ASAP but I don't have the money to afford these vet so I'm hoping I can ask my friends for help. The fact that this was the only flea preventative at the local Walmart is awful and I feel horrible knowing I did this to them.

Their excuse deflects responsibility; they're appointing non-veterinarians. I and all the customers who felt wronged will fight back. They won't silence us. They made three of my cats sick. The product is absorbed through the skin and made my cat sick. Their excuse was that the cats should be kept separate. They were, but they still got sick.

We just used Hartz Ultraguard Flea & Tick Topical on our 1 year old cat this past Sunday, 10/5/2025. Within 18 hours, he was throwing up multiple times and twitching uncontrollably. He was lethargic and disoriented- almost like he was drunk. We rushed him to the vet. They bathed him 3 times, IV flush, IV antitoxin and antiseizure meds via IV. And pills to give him for 3 days to help the twitching. The vet confirmed, 40% of the ingredients of the treatment is a pesticide that is TOXIC to cats. When I described him to the vet as acting drunk, he said "You're spot on. But instead of drunk, he has toxins affecting his neurological system." How can they sell this mess???

Terrible product. Do not buy and especially do not use on pet!! I used this on my cat and within 10-15 mins I noticed she was quite irritated by it so when I went to rub the spot for her the product burned my own skin. So I quickly washed my hands then had to wipe her clean. After this I looked up the product and saw that people have seen little problems like skin irritation all the way to seizures and death after using this product on their cats. I’ve stayed up all night to make sure she was okay and she has now started the lose all the hair on the back of her neck. Worst product ever and will continue to write terrible reviews about it so that nobody buys this anymore and they go out of business. They should be sued!!

I had a rescue cat that potentially had fleas. I put two drops on the base of the skull per the instructions on the cat/kittens version of the medication. Within 12 hours she lost all her hair in that spot and red blisters formed. I do NOT recommend this product!!! I feel so guilty for putting something on her that was harmful.

Hartz products for cats only such as flea and tick treatment flea collars and even the ear mite treatment contain **. Which is extremely toxic to cats even in small doses. I killed four of my cats. I didn't realize that's what it was until the last one. I will tell you it's a horrible way for them to die cause I sat with all of them and just wished for their death to come fast but no such luck and it's absolutely terrible. This stuff needs to be taken off the shelves immediately! I used the products just for cats not cats and dogs. I guess I don’t understand that if people are coming up and doing this products, I’ve done the research that they’re supposed to do. Don’t know that this is lethal the cats. They can’t adjust and it is extremely firsthand lethal even if I don’t ever give the full dose because I don’t trust pharmaceutical whatever but I don’t like them itching or whatever but so I panic and end up taking off them anyways and it still killed my cats and it’s terrible.

My beautiful 2-year-old lab was put down today 7/18/2025. I used the ultra guard flea and tick drop. Followed the directions and two days later bathed her with Dawn dish soap because I realized her symptoms was due to the drops. Coughing, vomiting, lack of appetite, symptoms got worse, took her to the vet. They giving her four shots, and the next day found out. She had kidney failure and had to put her down. Do not buy any of these products for your animals. My dog was very healthy until I put the drops on her. I miss her terribly. My heart is broken and this product needs to be taken off the shelves.

Would not recommend this product. It caused severe irritation to the skin and a very large patch of hair to fall out. This is a dangerous product and should be allowed to be sold in stores! There are many other reviews stating similar effects from this product. This product is dangerous and needs to be removed for sale!

I purchased Hartz Flea and Tick Treatment for Cats & Kittens at Walmart and applied it to my 16 year old cat as per directions. The next morning the treatment had burned off the skin and even all the hair the size of a quarter, plus she became lethargic and stopped eating. I immediately bathed the affected area several times a day, but it is still red and oozing. Then I went online and read all the negative reviews and warnings about this product.

A little over a year ago I purchased the flea and tick drops for my 3 cats. I had used this same medication for over a year. I used it on two of my cats in one day and a few days later on the third. They died in the same order. First, I would find them howling in the bathtub. My guess was that it was because it was the coolest place they could go. They would want to be held and loved on and then suddenly they would leap down and wouldn't want to be touched. The next day was the day that two of them died. And my last one seemed fine, not yet showing signs. It was about a week before they were treated that they all died.