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

By Hartz
Rated 3.0129 out of 5 stars
$5.28Chewy Price
$5.02Autoship Price
(Save an extra 5%)

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FREE 1-3 day delivery over $35

Frequently Bought Together

Capstar Flea Oral Treatment for Cats, 2-25 lbs, 6 Tablets
Rated 4.1066 out of 5 stars
$35.00Chewy Price

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Total Price: $45.72

About This Item


  • 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.

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Play Video: Learn More About Hartz From Our Team of Experts
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

Hartz has been delivering exceptional pet care products for over 95 years. The full range of pet care products are dedicated to the health and well-being of cats and dogs with a focus on making life with pets richer, easier, and more joyful.

Shop Hartz

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Top IngredientsTetrachlorvinphos, (S) - MethopreneTetrachlorvinphos 14.55%, (S)-Methoprene 1.02%, Other Ingredients 84.43%....Tetrachlorvinphos 14.55%,Other Ingredients 85.45%Tetrachlorvinphos, (S) - MethopreneActive Ingredient: Tetrachlorvinphos (14.55%)
LifestageAdultKitten, Adult, SeniorAdultAdultKitten, Adult
Collar TypeFlea & TickFlea & TickFlea & TickFlea & TickFlea & Tick

Questions & Answers

20 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 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.

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

ReviewsWrite a Review

Rated 3.0129 out of 5 stars
389 Ratings
Would recommend to a friend

387 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 Purrplexed on Sep 15, 2023


HORRIBLE product! Within a week and a half both of my cats had their fur literally eaten off by this product!! AVOID AT ALL COSTS!!! Chewy worked with me to refund the cost of the product and also a discount on medicine to take care of the skin irritation. My cats smell horrible right now, I'm hoping the skin will be okay until the fur grows back in. I am just devastated. We started them on a topical flea and tick treatment yesterday, here is hoping there are no side effects.

Rated 1 out of 5 stars
By collar on Sep 9, 2023

Didn’t work

I never write reviews so, take that how you will — my cats have been infested with fleas for a while now and this collar didn’t do anything. Maybe for a short while. But it didn’t work Long term (or even through a month). Not worth it, I promise! My cats are still covered & I’m honestly, frantically trying to find something that will work. I promise you these don’t.

Rated 1 out of 5 stars
By Shelby on Sep 8, 2023

2 weeks & no results

I've had the collar on both cats for two weeks now and they're still scratching their necks just as hard. The collars do not seem to be working.

Rated 1 out of 5 stars
By HisBeauty209 on Aug 20, 2023

Gave my cats chemical burns

All 4 of my adult cats have chemical burns from these collars. I was only able to take one photo. The others won't let me near their necks:-(

Rated 1 out of 5 stars
By Donotuse on Jun 15, 2023

If I could give this product zero stars I would! The experience I had was absolutely horrible and terrifying. I got this product because it was not as strong as some other collars I have found but that is honestly not the case. I had gotten this product for my cat for a vacation where the fleas and ticks pretty bad. The first week of him wearing the collar was fine nothing strange but as soon as the second week started he started to act out of i, not wanting to eat and then finally a none stop pacing that would only stop if me or my bout would hold him. He started to act as if he was highly drugged and at 4 in the morning I found him staring at the floor in the bathroom not wanting to move. I immediately took the collar off and gave him a bath which help a little because he at again. But that following evening it became worse again with him peeing twice and throwing up, I was able to get him into the emergency vet. He told me that the active ingredient tetrachlorvinphos is used to kill corn worms and highly poisonous to cats and dogs and can give humans cancer. He thankfully had a antidote he gave my cat and told me to give him up to two more baths with dawn soap. I can do thankfully and lucky I did not loose my sweet boy buddy due to this product. Please please please take to your vet about flea and tick medicine don’t go of the internet on reviews. This was a lesson well learned.

Rated 5 out of 5 stars
By Jean on Sep 12, 2023

Good flea collar

I have been using this flea collar for awhile now and I haven’t seen any fleas at all on both of my cats

Rated 1 out of 5 stars
By Jenn1of6 on Jul 12, 2023


Found the product to be ineffective. It doesn't even drive the fleas to a different part of the body. You just have an extra collar to move out of the way to comb off the fleas.

Rated 2 out of 5 stars
By shay on Sep 6, 2023

not so good

i only gave it 2 stars is because it made my cat sick, shes ok now, probably work on other cats

Rated 1 out of 5 stars
By Shelby on Jul 19, 2023

Doesn't work

The fleas were literally under the collar around my (indoor) cats neck, it's more like it attracted them than repelled them

Rated 4 out of 5 stars
By 8102029 on Aug 13, 2023

works but not for 7 months

Lasted like a month then stopped working cat got fleas around her neck again