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

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

By Hartz
Rated 3.2222 out of 5 stars
$7.97Chewy Price
$7.57Autoship Price
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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.
  • 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.

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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.

Questions & Answers

5 Customer Questions

do you have collar for medium dogs?
Answer by ChewyMar 28, 2019
The Hartz UltraGuard Plus Reflect-X Flea & Tick Collar is recommended for medium and large breed dogs and puppies over 12 weeks and fits necks up to 22-inches.

What is the stuff that is harmful? Like if i touch the collar will it harm my skin?
Answer by ChewyMay 18, 2022
It is recommended to use Flea & Tick Collar as directed. Harmful if swallowed or absorbed through skin. Causes moderate eye irritation. Avoid contact with eyes, skin, or clothing. Wash thoroughly with soap and water after handling.

Can the chemical in it cause seizures for dogs? We had ours on frontline and 2 of our dogs had seizures which never had before,
Answer by ChewySep 09, 2020
An individual pet may have a sensitivity to a particular component of the product that cannot be predicted or anticipated. All Hartz flea and tick medication has undergone the rigorous clinical tests required to meet the safety and efficacy standards of the EPA. We recommend consulting with your veterinarian for the safest results with your pet.

Can you put this underneath their collar?
Answer by ChewyApr 21, 2018
It is okay to wear this along with a walking collar.

ReviewsWrite a Review

Rated 3.2222 out of 5 stars
27 Reviews
Would recommend to a friend

27 Customer Reviews

Filter by reviews that mention

Rated 5 out of 5 stars
By Flea on Apr 8, 2022


Always purchased 6 months before requiring replacement of previous flea collar. Works that good! Want to make sure it's available just in case.

Rated 5 out of 5 stars
By Peace on Aug 20, 2021

Kody Eng Smith

The flea medicine that I ordered was wonderful I had never used it before but it works way better than having to put the drops on him and I highly recommend these bravecto flea medicine for your pets it's absolutely wonderful

Rated 1 out of 5 stars
By Nelley on May 7, 2021

Don’t waste your money

Collar doesn’t work. My poor pup is still suffering from fleas. It doesn’t kill.. nor does it repel. He has more fleas now than what he started with when I bought this collar. I’m very disappointed.

Rated 3 out of 5 stars
By Rory on Nov 20, 2020

Used To Work Amazingly, Can't Say The Same Now....

I really like this collar, and have purchased it a few times so far. It works well, when you use it right. In my last order, I bought 2 of these so that we had a backup when the first one was ready to be replaced, but the collar changed juuusssttt a bit since the last time we bought it. They used to be coated in powder, but now you have to stretch the collar to activate it. I didn't read the instructions, because I thought I knew how to use it, but like I said, it changed. For that reason, it didn't work, but that was my fault. I put the second one on my pup after I gave her a bath with shampoo that supposedly kills fleas, but it didn't, so I put the collar on anyways, in hopes that it would kill the fleas. But it didn't. She currently has fleas, and this collar isn't working. She's not getting any more fleas, but they aren't being repelled, either. Hartz, please change the collars back to what they were before! They used to work amazingly!

Rated 4 out of 5 stars
By KikiBox on Oct 2, 2020

Right On Time

The only thing wrong was the large just barely fit around my dog's neck. He is a 4 year old GS. I guess I need XL next time.

Rated 1 out of 5 stars
By Amandavega on Aug 24, 2020

Don’t waste your money

These don’t work. I had them on all 4 dogs after dawn baths and the fleas kept coming back. I also treated the house and yard. Collars still did nothing.

Rated 5 out of 5 stars
By Lynette on Jun 18, 2019

Life saver

I love the flea collars, they are life savers. I put one on each of my 3 standard poodles and it is wonderful. We live in a small camper due to our house burnt so we are in tight quarters. Fleas were everywhere...OMG how horrifying it was. These Hat rtz ultra guard plus are the new love of my life. forever will my poodles wear them.

Rated 5 out of 5 stars
By Collar on Sep 4, 2019

Dog coller

Works good fits our dog good and I like the color smells good instead of having bad smell would recamend this to anyone

Rated 5 out of 5 stars
By Gunner on Oct 13, 2019

flea and tick collar

It seems to be working just fine. Have not seen fleas or ticks.

Rated 5 out of 5 stars
By Diva on Aug 3, 2019

Hartz for dogs

I love these collars my baby never has problems with this