Hartz UltraGuard Plus Dog Flea & Tick Collar for Dogs, X-Small & Toy & Small Breeds

By Hartz
Rated 3 out of 5 stars

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$5.22Chewy Price
$6.53Chewy Price
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$1.31 (20%)
$4.96Autoship 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.
  • For puppies 12 weeks of age and older and can be adjusted to fit necks up to 15 inches.
  • Water resistant collar continues to fight fleas when wet and allows your pup to play in the rain, take a bath and even go for a swim without removing.
  • Kills through contact - eliminates fleas & ticks.
  • Proudly made in the USA of domestic and imported materials to protect your companion from pesky fleas, flea eggs and ticks.

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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.

Frequently Bought Together

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

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.

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Top IngredientsActive Ingredients: Tetrachlorvinphos 14.55%.Active Ingredients: Tetrachlorvinphos 14.55%.Tetrachlorvinphos: 14.55%, (S)-Methoprene: 1.02%, Other Ingredients: 84.43%....Tetrachlorvonphis: 14.55%, Other Ingredients: 85.45%Active Ingredients: Tetrachlorvinphos 14.55% (S), Methoprene 1.02%.
Breed SizeExtra Small Breeds, Small Breeds, Medium Breeds, Large BreedsLarge BreedsExtra Small Breeds, Small BreedsExtra Small Breeds, Small Breeds, Medium BreedsSmall Breeds, Medium Breeds, Large Breeds, All Breeds
LifestagePuppyAdultPuppy, Adult, SeniorPuppy, Adult, SeniorPuppy, Adult, Senior
Collar TypeFlea & TickFlea & TickFlea & TickFlea & TickFlea & Tick

Questions & Answers

4 Customer Questions

For my puppy that is two months for ticks and fleas
Answer by ChewyNov 30, 2021
This UltraGuard Plus Flea & Tick Collar for Puppies is suitable for puppies 12 weeks of age and older.

Us this waterproof?
Answer by ChewyJun 28, 2020
This collar is water resistant which allows your pup to play in the rain, take a bath and even go for a swim without removing the collar.

does the collar come with a plastic storage container or anything to keep it stored while not in use, or do I have to provide a container for it?
Answer by ChewyApr 08, 2020
This collar will arrive in a sealed package. When ready to use, Place the collar around the dog's neck, adjust for proper fit and buckle in place. It can be worn at all times and provides 7 months of protection.

Would this be appropriate for an older small dog also?
Answer by ChewyJul 28, 2018
This product is just for intended for use in puppies, but Hartz does offer a UltraGuard Plus collar for small dogs available for purchase on their site.

ReviewsWrite a Review

Rated 3 out of 5 stars
32 Ratings
Would recommend to a friend

31 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 2 out of 5 stars
By Rochelle on Nov 8, 2023

Hartzell dog flea collar

The collar didn’t work as advertised. I had to also purchase Hartzell shampoo and I also had to add premise spray but my dog is still itching and I’m still seeing fleas on him.

Rated 1 out of 5 stars
By Owlcatlover on Sep 27, 2022

Useless against fleas

Already reviewed liquid for cats as useless and this for my dog was just as useless. I would give 0 stars for sure if I could! I will never buy any Hartz product ever again!

Rated 4 out of 5 stars
By kayla2hands on Jul 13, 2022

works! Thank you

Drops were not working but this does. The more expensive Pet Armor did not work. Even if it only works for a month i still save money. The fleas are terrible because we have heat and humidity, so I am so glad it works.

Rated 1 out of 5 stars
By Jenn4 on Nov 21, 2022

Flea collar

Glad it wasn't expensive because it doesn't work.

Rated 5 out of 5 stars
By Sonia on Nov 2, 2022

Great product

Perfect fit bought several all good buying more love Chewy

Rated 5 out of 5 stars
By Nova on Jun 1, 2022

Am buying again

I’ve bought Soresto before and works fine. But the price has gone up like crazy. I bought the Hartz Ultraguard and worked just the same. I did give them a flea bath and sprayed my yard for fleas because apparently cats are not afraid of my dogs and use my yard as a shortcut.

Rated 4 out of 5 stars
By Longfordlady on Aug 5, 2022

hartz collars

Just tried these collars and so far so good. but they have only been on a couple of weeks so far......

Rated 5 out of 5 stars
By pattykat on Oct 22, 2021

Sir Bentley's fleas

I was paying the Vet $39 a month for internal medication for fleas and ticks. I decided to try a flea collar instead, and he pays no attention to it. It doesn't bother him at all even though he has sensitive skin, and he smells nice too. We like to be protected since there are stray cats around, and you never know what can be in the grass on our walks. It's a great solution!

Rated 5 out of 5 stars
By PolishedBreath on Feb 16, 2022


Good product. Have used for many years. Will continue.

Rated 1 out of 5 stars
By Desire on Jul 14, 2021

Be watchful

I bought this flea collar for our 7 dogs and I realized very quickly that it was the collars making some of my dogs very sick, especially one that has heart disease so be very watchful when getting this particular flea collar for your dogs. It took about 2 days when I finally realized that 4 of my seven dogs were struggling with walking and crying for no reason. I quickly removes their collars and about 10 hours later they were feeling much better. The other 3 dogs are doing well though.