Hartz UltraGuard Flea & Tick Collar for Dogs, up to 20

Hartz UltraGuard Flea & Tick Collar for Dogs, up to 20" Neck, 1 Collar (7-mos. supply)

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Help your furry friend fight pesky fleas and ticks with this Hartz UltraGuard Flea & Tick Collar! Specially designed for small canine companions, this collar can help combat fleas and ticks for up to 7 months. It’s completely adjustable for a comfortable fit and it’s also water resistant, so your paw-tner can stay protected while playing in the rain. When it comes to flea and tick control, Hartz has your pal covered!

Key Benefits
  • Can combat both fleas and ticks for up to 7 months, giving your pal the long-lasting protection she needs.
  • Water-resistant collar continues to fight fleas when wet.
  • Kills through contact—eliminates fleas and ticks.
  • This collar is specially designed for small dogs.
  • Proudly made in the USA.

Use only on dogs. Do not use on puppies under 12 weeks of age.

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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  • Item Number
  • Weight
    2.08 ounces
  • Lifestage
  • Breed Size
    Extra Small & Toy Breeds, Small Breeds, Giant Breeds
  • Collar Type
    Flea & Tick
  • Product Form
  • Health Condition
    Fleas, Ticks

Active Ingredients: Tetrachlorvinphos 14.55%.


Remove collar from package, unroll and stretch to activate insecticide generator. As the collar begins to work, a fine white powder will appear on the surface.

Do not unroll collar until ready to use. Place the collar around the dog's neck, adjust for proper fit and buckle in place. The collar must be worn loosely to allow for growth of the dog and to permit the collar to move about the neck.

Generally, a properly fitted collar is one that, when fastened, will snugly slide over the dog's head. Leave 2 or 3 inches on the collar for extra adjustment and cut off and dispose of the extra length.

Storage and disposal: Do not contaminate water, food or feed by storage and disposal.

Pesticide storage: Store this product in a cool, dry place that is inaccessible to children.

Pesticide disposal: If empty; nonrefillable container. Do not reuse or refill this container. Offer for recycling, if available. If partly filled: call your local solid waste agency for disposal instructions.Never place unused product down any indoor or outdoor drain.


Where is this product sourced from?

We source all our products from manufacturer approved distributors or directly from the manufacturers. Chewy takes pride in ensuring that our furry friends’ wellbeing is always our top priority. We have worked hard to partner with all of the manufactures to deliver 100% authentic products

About UltraGuard Collars for Dogs

The Hartz Commitment

The Hartz Commitment

Hartz treasures the bond between you and your pet, and they’re committed to providing you with products designed to protect and rid your pets of fleas, ticks and mosquitoes year-round. Make your pet one of the 5 million furry family members Hartz helps keep pest-free and happy every year!

UltraGuard Collars for Dogs

Fleas and ticks aren’t just an annoyance for your dog, they can also transmit diseases. Hartz UltraGuard Flea and Tick Dog Collars provide active, full body  flea and tick control for your pets, to protect against pests and prevent problems before they can take hold.

UltraGuard Collars for Dogs

Affordable Protection that Performs

Hartz UltraGuard Collars provide head-to-tail protection from fleas and ticks for up to 7 months. They’re easy to put on and take off and have a water resistant design that stays effective even after rain play, swims and baths.


One collar provides full body protection for up to 7 months, protecting your pet through warm weather and cool seasons, too.


Active ingredients in the collar release slowly over your dog’s skin surface, providing continuous coverage.


Lasting protection is as easy as fastening a collar that’s non-greasy and can be worn with a regular collar, too.


A dip in the pool or a bath won’t reduce the effectiveness of this collar because it’s water resistant!

Choose the Collar That’s Right for You





















About Hartz

Hartz has been delivering exceptional consumer pet care products for over 90 years. Their goal is to provide innovative, trustworthy and affordable products that strengthen the bond between pets and people, and to offer the knowledge and support people need to better care for their pets. Their mission is a world where every pet can lead a healthy, happy and long life in a loving home.

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About Hartz

Rating: 3.0 of 5 stars 32 Reviews 32 Reviews 3 out of 5 Stars

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56% Recommend

56% of reviewersrecommend this product

Rating: 3.0 of 5 stars 3 / 5

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32 Reviews

Showing 1-10 of 32 Reviews

  • 3 out of 5 stars

    Not very effective

    By DiGuM on Apr 28, 2021

    Does not seem to work very well. Have a Lhasa Apsa which we shave down every 3 months, so her hair is relatively short. Have had this collar on for about a month and we are still finding live fleas on her. She is allergic to most internal flea remedies so it is difficult to control fleas here in Florida. We wound up putting a flea powder on her as well as the collar.

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  • 2 out of 5 stars

    Not as effective as I would like

    By Steff on Mar 20, 2021

    I have six dogs. All of my dogs are 50/50 inside and outside. I was not impressed with the flea collars that I purchased. Even though the dogs are bathed routinely and wear the collars, they did not help. Fleas just seemed to migrate to the hind quarters instead of the head and neck. "Live and learn" I guess . I will try the flea drops next. Maybe the fleas in Texas are just tough!

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  • 5 out of 5 stars

    Flea dog collar

    By Juango on Mar 1, 2021

    I buy this product all the time works great.Never had a problem with fleas or ticks.

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  • 3 out of 5 stars

    Flea collar

    By Noname on Mar 27, 2021

    The clasp on the collar doesn’t work well. So it keeps coming off.

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  • 5 out of 5 stars

    Dog collars

    By Nana on Apr 8, 2021

    Love the price, love I can order on line, Delivery is fast

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  • 1 out of 5 stars

    My dog still has fleas.

    By Jean on Jan 11, 2021

    I gave my dogs a bath,dipped them,put collars on,but still have fleas So I guess the collars don't work for me

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  • 5 out of 5 stars

    Hartz Guard

    By Scrappy on Dec 9, 2020 top1000Contributor

    My dog was itching a lot so I got him his flea collar, up to know he hasn't been scratching as he was. No bad scent either!

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  • 5 out of 5 stars

    Satisfied 01

    By Lovely on Jan 1, 2021

    Awesome, is all I can say, Maria is a wonderful person, very nice and she knew everything

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  • 1 out of 5 stars

    do not purchase this item

    By faith on Aug 25, 2020

    I bought 3 of these collars for my dogs one day after applying them fleas were still present so I read the instructions again and thought since it had not been a total 24 hours since applying that would be the reason they still had fleas wrong it has now been 1 week and the fleas are still there smh awaiting new products I recently ordered online

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  • 5 out of 5 stars

    Just What I needed

    By mooch on Oct 26, 2020

    Thanks and didn't have to out to store. Which is great for an 82 year young . Who needs her Dog to keep her going. Thanks again and God Bless you

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