Hartz UltraGuard Plus Flea & Tick Collar for Dogs, Medium & Large Breeds, 1 Collar (7-mos. supply)

By Hartz
Rated 3.7292 out of 5 stars
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Hartz UltraGuard Plus Flea & Tick Collar for Dogs, Medium & Large Breeds, 1 Collar (7-mos. supply) slide 1 of 8
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Hartz UltraGuard Plus Flea & Tick Collar for Dogs, Medium & Large Breeds, 1 Collar (7-mos. supply) slide 1 of 8
$6.28Chewy Price
$5.97Autoship Price
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About This Item

  • Provides full body protection from fleas and ticks for up to 7 months and can kill and even prevent flea eggs for up to 7 months—stopping the flea life cycle to help prevent reinfestation.
  • Specially designed for large dogs and can be adjusted to fit necks up to 22 inches.
  • Water resistant collar continues to fight fleas when wet and allows your dog to play in the rain, take a bath and even go for a swim without removing.
  • Kills through contact—eliminates fleas and ticks.
  • Proudly made in the USA.

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.

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Top IngredientsActive Ingredients: Tetrachlorvinphos 14.55%.N/AActive Ingredients: Tetrachlorvinphos 14.55%.Tetrachlorvinphos: 14.55%, (S)-Methoprene: 1.02%, Other Ingredients: 84.43%....Active Ingredients: Tetrachlorvinphos 14.55%.
Breed SizeLarge BreedsMedium Breeds, Large BreedsExtra Small & Toy Breeds, Small Breeds, Medium Breeds, Large BreedsMedium Breeds, Large Breeds, Giant BreedsExtra Small & Toy Breeds, Small Breeds, Giant Breeds
Collar TypeFlea & TickFlea & TickFlea & TickFlea & TickFlea & Tick

Questions & Answers

5 Customer Questions

What specific types of ticks does the collar protect from?
Answer by ChewyAug 03, 2021
The UltraGuard Plus Flea & Tick Collar for Dogs will protect from Brown Dog and Deer ticks only.

My dog weighs 10 lbs will this not fit or be too strong
Answer by ChewyMar 16, 2021
This flea and tick collar is suitable for Medium and Large breed dogs only. It fits dogs with necks that measure up to 22 inches. We recommend the Hartz UltraGuard Plus Dog Flea & Tick Collar for Dogs, X-Small & Toy & Small Breeds available on our site.

How long does this need to be worn?
Answer by ChewyMar 07, 2022
This collar provides full body protection from fleas and ticks for up to 7 months.

how old dose a puppy need to be
Answer by ChewyNov 05, 2021
This should not be used on puppies younger than 12 weeks old.

ReviewsWrite a Review

Rated 3.7292 out of 5 stars
48 Reviews
Would recommend to a friend

48 Customer Reviews

Rated 5 out of 5 stars
By Galaxygirl on Apr 24, 2022

Furrific buy

Got this as an added layer of protection for my 3 1/2 y/o Boxer bc we live by the beach. She takes oral meds for fleas/ticks, but they can be sneaky. Best not to take any chances. The pup wears it with her regular collar, so she kinda looks boho with that extra necklace. As always, Chewy came through with a great price and quick turnaround on the order.

Rated 5 out of 5 stars
By Sweetie on Mar 18, 2022

Hartz flee and tick collar

I tried this collar for the 1st time on my dog, and it works great! I'm so glad it worked, because the last collar I used that cost $28.00 did NOT work but for three days, then my dog was scratching horribly so. I went on Chewy and ordered the Hertz collar 3 months ago, and it is still working!!! Thank you Hertz, and thank you Chewy for selling this product!!

Rated 4 out of 5 stars
By Mamacas on Apr 4, 2022

easy peezy

I had ordered Hartz fleas and tick collars because it is a back up for the upcoming spring season. With Hartz I know that neither of our 2 dogs will have any adverse reaction as I have had with other dogs using more expensive collars. Shopping through Chewy just makes taking care of our pooches so much easier!

Rated 1 out of 5 stars
By 402cowboy on May 20, 2022

Worst I’ve ever seen

Extremely disappointed! My dog has acquired more tics since wearing this than ever before! HORRIBLE

Rated 5 out of 5 stars
By Mac1 on Apr 26, 2022

Not one problem

I have always bought these and a topical to use 2 times through the summer, they work for me.

Rated 1 out of 5 stars
By Kenny on May 4, 2022

waste of money

Didn’t work on my 30lb or my 50lb dog. they still have fleas and ticks.

Rated 5 out of 5 stars
By Cindylou on Mar 31, 2022

Hartz flea and tick collar

Seems to be working fine. Smells good too! Doesn't irritate my dogs neck either.

Rated 1 out of 5 stars
By awful on Oct 29, 2021

Don’t even waste $1

I know “you get what you pay for” But I wanted to try a cheaper solution for my dogs and cat. Well I tried and it sucks… Doesn’t even work for one day. Honest review! This collar has been on my cat and dogs for the appropriate size and it doesn’t work at all. I waited to see if maybe a few weeks in, it will be good… nope now my house has fleas and I have to totally debug everything. I NEVERRR had this issue before! So thanks Hertz UltraGaurd for irrigation my pets necks, not working, and wasting my money.

Rated 5 out of 5 stars
By Betty on Dec 1, 2021

Hartz flea collar

Love the Hartz flea collar! Our lab has allergies & couldn't wear any other brand of flea collar without throwing up & diarrhea. We tried 5 different brands & ended up giving them away but he is doing very well with Hartz! I am so relieved :-)

Rated 5 out of 5 stars
By Jeanne on Oct 31, 2021

Good Tick Collar

So far so good, have been plagued with ticks in my yard this summer and got tired of pulling them off the dogs so got these I used to use another product but too expensive when you have 3 dogs so figured I would try this, I have not had any ticks since putting them on the dogs and I did up until I used the collar so thinking it is working.