Hartz UltraGuard Plus Flea & Tick Collar for Dogs, Medium & Large Breeds, 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.
  • Features a reflective strip that reflects direct light up to 300 feet for bonus visibility.
  • Recommended for large dogs and puppies over 12 weeks and fits necks up to 22-inches.

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 Dog Collars

Why Choose a Hartz Flea & Tick Collar?

Hartz Flea & Tick Collars provide convenient, mess-free flea and tick protection. Easy to put on and adjust for comfort, they can be worn alongside your dog’s regular collar.

How Hartz Flea & Tick Collars Work

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

Long-Lasting Flea & Tick Protection

Pest Protection

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

Full Body Protection

The active ingredients spread across your dog’s skin, providing continuous, full-body coverage for up to 6 months.

Water Resistant

UltraGuard collars are water-resistant, so they won’t lose their effectiveness if your pup takes a stroll in the rain.

Don’t Settle for Stiff

Hartz UltraGuard collars are soft and flexible to provide comfortable flea and tick protection.

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

2 Customer Questions


where are the ingredients?

Answer by ChewyMar 30, 2023
The active ingredients of this collar are Tetrachlorvinphos (14.55%) and (S) Methoprene.(1.02%).

Can you put this underneath their collar?

Answer by ChewyApr 21, 2018
It is okay to wear this along with a walking collar.
3.9
Rated 3.9 out of 5 stars
92 Ratings

46 Customer Reviews



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

Rated 4 out of 5 stars
By Tena on Aug 10, 2025

In Colorado we don't get ticks and fleas often. I have lived here 50 years

But the last two years, my Rottweiler has collected them like they are toys. 1st, I tried one of those 'all-natural' collars, didn't work. These did work, but

But the last two years, my Rottweiler has collected them like they are toys. 1st, I tried one of those 'all-natural' collars, didn't work. These did work, but not for seven months. I had to replace them after three, months.


Rated 1 out of 5 stars
By C.jameson on Aug 16, 2025

Price

Dog freaked out when I put in her! She was acting like the chemical was effective and panting real bad,running in circles. very scary so I took. It off because of

Dog freaked out when I put in her! She was acting like the chemical was effective and panting real bad,running in circles. very scary so I took. It off because of reaction


Rated 1 out of 5 stars
By Kathryn on Nov 10, 2025

I read the contents , I had beforese CANCER"!!!!o be!

Causes CANCER!!!! What were they thinking?? I did not use it!

Causes CANCER!!!! What were they thinking?? I did not use it!


Rated 5 out of 5 stars
By Audra on Aug 14, 2025

Collars are easy flea control

I use these collars on both my dogs and I have never had a flea problem. I really like the reflective safety feature too.

I use these collars on both my dogs and I have never had a flea problem. I really like the reflective safety feature too.


Rated 5 out of 5 stars
By Frank on Nov 6, 2025

Got here fast

Chewy always gets my packages to me quick.

Chewy always gets my packages to me quick.


Rated 5 out of 5 stars
By Dominique on Jun 2, 2025

Easy

I have used these collars in the past and I really like them. They work well and are easy to put on and mess free. They do have a smell to them.

I have used these collars in the past and I really like them. They work well and are easy to put on and mess free. They do have a smell to them.


Rated 5 out of 5 stars
By Tracy on Jul 28, 2025

Works well

These work well and don’t break the bank. Would recommend.

These work well and don’t break the bank. Would recommend.


Rated 2 out of 5 stars
By Anna on Apr 6, 2025

Good price, but doesn't seem to work

I have huskies and 5 days after switching from Nextguard to the collar, one of my huskies had a huge engorged tick on his neck. I'm doubting the effectiveness of

I have huskies and 5 days after switching from Nextguard to the collar, one of my huskies had a huge engorged tick on his neck. I'm doubting the effectiveness of these collars.


Rated 1 out of 5 stars
By Theresa on Jun 11, 2025

Chewy

I only received 1 of 2 flea collars I ordered & was charged for

I only received 1 of 2 flea collars I ordered & was charged for


Rated 5 out of 5 stars
By Hilda on Aug 30, 2025

They were very good

Yes, my dogs were allergic.

Yes, my dogs were allergic.