Hartz UltraGuard Plus Flea & Tick Collar for Cats, 1 Collar (7-mos. supply)

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About This Item

Details

  • Water-resistant flea and tick collar is an easy alternative to traditional topical flea treatments.
  • Works for an impressive 7 months to effectively kill and repel fleas and ticks.
  • Also prevents flea eggs from hatching to stop the flea life cycle and prevent re-infestation.
  • Breakaway design will come apart if your cat gets caught on something.
  • Adjustable design can be cut to fit your cat’s neck, and it features a clean, fresh scent.

Ingredients

Instructions

Size

FAQ

Learn More About Hartz From Our Team of Experts

Important Information

Fleas rise to the top of your pet's coat as they die, so consider it a triumph if you start seeing more fleas at first, after treating your pet. If you’re still seeing fleas after application, it may be because your pet has picked up new fleas from the environment, which may include other pets, surfaces and outdoor areas. It may take up to 30 days to break the entire flea life cycle. Additionally, you should also treat sources of new fleas (i.e., carpet, yard, etc.) to ensure complete flea control.

About Hartz Ultraguard Cat Collars

Why Choose a Hartz Flea & Tick Collar?

Hartz Flea & Tick Collars provide convenient, mess-free flea and tick protection that is easy to put on and adjust for comfort. These flea and tick collars protect for up to 7 months, and they can be worn alongside your cat’s regular collar.

How Hartz Flea & Tick Collars Work

Hartz Flea & Tick Cat Collars contain active ingredients that are slowly released and spread over your cat’s body. These active ingredients kill and repel fleas and ticks to keep your cat pest-free and happy.

Long-Lasting Flea & Tick Protection

Pest Protection

Hartz UltraGuard cat collars kill and repel fleas and ticks and can be worn with your cat’s regular collar.

Full Body Protection

The active ingredients spread across your cat’s skin, providing continuous, full-body coverage for up to 7 months.

Breakaway Design

A breakaway release snap helps keep the collar from getting caught on things like branches and fences for safety.

Don’t Settle for Stiff

Hartz UltraGuard ProMax is a soft and flexible flea and tick collar that will keep your cat comfortable and protected.

About Hartz

For more than 95 years, Hartz has been dedicated to creating products that show pets the same unconditional love they give us. Hartz is a leader in quality, innovative products for dogs and cats, including Oinkies, Delectables, UltraGuard, Nature’s Shield, Home Protection, Comfitables, and Groomer's Best brands. Through the Hartz Loving Paws shelter outreach program, Hartz is committed to helping animal welfare organizations that protect and care for pets until they find their forever homes.

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Questions & Answers

21 Customer Questions


What are the active ingredients in this cat tick flea collar how can I view all ingredients in any of your cat flea tick products to compare

Answer by HeavenMay 19, 2023
Tetrachlorvinphos, (S) - Methoprene are the active ingredients in this cooler. All of the active ingredients are on the first picture shown.

Are these manufactured in the USA?

Answer by ChewyApr 30, 2019
This collar is made in the United States.

Does it have a break away mechanism?

Answer by ChewyFeb 28, 2019
This collar is designed with a break-away mechanism, for safety.

Does this collar have an odor?

Answer by ChewyMay 14, 2019
While this collar may have an odor to it, avoid breathing vapors. If inhaled, move to fresh air.

3.8
Rated 3.8 out of 5 stars
1406 Ratings

584 Customer Reviews



Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.

Rated 1 out of 5 stars
By daryn on Jan 14, 2026

Do not buy!!

I’ve used multiple different flea collars on my cats over the years and have never had an issue until this one. I put this collar on my cat and within about 10 minutes

I’ve used multiple different flea collars on my cats over the years and have never had an issue until this one. I put this collar on my cat and within about 10 minutes I found her bloody, panicking, and freaking out with the collar stuck in her mouth. This collar claims to have an easy-release safety feature, but it did not release at all. I had to cut it off to get it off her. This was terrifying and completely unacceptable. No flea prevention product should ever put an animal at risk like this. This is not worth the risk do not buy.


Rated 5 out of 5 stars
By Eiko on Nov 25, 2025

Excellent Customer Service

I've been taking care of my daughter's cat, Misty while she has been in Japan for work this past year. Misty is elderly and very picky. Recently, I received a pack

I've been taking care of my daughter's cat, Misty while she has been in Japan for work this past year. Misty is elderly and very picky. Recently, I received a pack of free Fancy Feast Gems at a supermarket, so I gave it to Misty. She loved it and cleaned her plate, so I bought two boxes. She enjoyed them so much that it made me happy too. I told my daughter in Japan. She told me to order them from Chewy. I placed an order and my order was delivered. However, when I gave her the last pack, Misty suddenly refused to eat the Gems at all. I was really disappointed ---but there was nothing I could do. I felt bad, but I emailed Chewy to explain the situation. Chewy responded kindly and helpful. My daughter has been highly praised for Chewy's customer service and I totally agree! Thank you for your service. I love you, Chewy!!


Rated 1 out of 5 stars
By Kristina on Dec 11, 2025

Flea Collars Didn't work

Ordered one for each of my cats after noticing a couple fleas. They did nothing and now the problem is worse than ever. All my cats are miserable while we wait for

Ordered one for each of my cats after noticing a couple fleas. They did nothing and now the problem is worse than ever. All my cats are miserable while we wait for other medicine to start working.


Rated 1 out of 5 stars
By Kimberly on Oct 29, 2025

DO NOT GET

Per my vet this brand is not the best and is known for having a lot of medical issues. I got this collar, a week later my cat started wheezing, wasn't eating and

Per my vet this brand is not the best and is known for having a lot of medical issues. I got this collar, a week later my cat started wheezing, wasn't eating and was constipated. I ended up spending almost $1000 on medical for treatment, medication, and visit when once we removed the collar, my cat started feeling better


Rated 1 out of 5 stars
By Steve on Oct 6, 2025

the collar doesn't work

I followed the instructions on the package. I put the first collar on Drake and waited two weeks nothing happened. I placed the other collar on Drake and still no

I followed the instructions on the package. I put the first collar on Drake and waited two weeks nothing happened. I placed the other collar on Drake and still no results. After talking to vet about it she stated that brand of collar is so inexpensive and used a lot for fleas it has become ineffective. Someone on your end messed up the description of the item I bought, I bought flea collars not lickable dog treats


Rated 1 out of 5 stars
By Judy on Oct 21, 2025

Horrible

My kittens like to go outside and I live by the woods and they never had fleas before but I got them this as a prevention and now they have so many fleas and constantly

My kittens like to go outside and I live by the woods and they never had fleas before but I got them this as a prevention and now they have so many fleas and constantly scratching. Do not recommend. Item must be defective because the reviews seemed good but it didn’t help my kittens at all


Rated 1 out of 5 stars
By Melissa on Oct 6, 2025

Isn’t working in the slightest

I’m shocked, honestly. Both of my cats spend the entire day biting themselves, even after wearing the collars for some days. I thought maybe it would take a bit

I’m shocked, honestly. Both of my cats spend the entire day biting themselves, even after wearing the collars for some days. I thought maybe it would take a bit of time before the collars started working, but they haven’t helped in the slightest.


Rated 5 out of 5 stars
By darlene on Sep 16, 2025

Hartz has been around awhile

It doesn’t matter how much you clean, it seems living next to the woods can get fleas into the house. So to protect XENA we use Hartz brand flea collars. She’s an

It doesn’t matter how much you clean, it seems living next to the woods can get fleas into the house. So to protect XENA we use Hartz brand flea collars. She’s an indoor cat, and the other pets have moved. So Hartz works well. This collar replaces the one she has on and we are set for spring now. I like being prepared!


Rated 1 out of 5 stars
By June on Oct 20, 2025

Side effects

My cat got severe reaction to it after 2 to 3 days of having the collar on her she refuse to eat or drink could hardly walk was pooping and peeing on itself

My cat got severe reaction to it after 2 to 3 days of having the collar on her she refuse to eat or drink could hardly walk was pooping and peeing on itself


Rated 5 out of 5 stars
By marilyn on Jan 10, 2026

7 months wow

They appear to be comfortable, light weight and breakaway, perfect.

They appear to be comfortable, light weight and breakaway, perfect.