Hartz UltraGuard Flea & Tick Collar for Dogs, up to 26" 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 large 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 designed for large dogs.
  • Proudly made in the USA.

Use only on dogs. Do not use on puppies under 12 weeks of age.
No toy is indestructible. Supervise your pet when using since small parts can present a choking hazard or internal blockage. Discontinue use if the toy is damaged. Keep out of reach of children

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
    2.24 ounces
  • Usage
  • Lifestage
  • Breed Size
    Large 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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Rating: 2.3 of 5 stars 6 Reviews 6 Reviews 2.3 out of 5 Stars

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50% of reviewersrecommend this product

Rating: 2.3 of 5 stars 2.3 / 5

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6 Reviews

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  • 1 out of 5 stars

    Don’t work

    By Curls on Oct 29, 2021

    Wouldn’t recommend. Doesn’t kill fleas. Doesn’t even later 7 months, more like 2 days. Have to give my dogs baths almost every week. Please don’t get.

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  • 1 out of 5 stars

    Take action now

    By Chase on Sep 7, 2021

    Horrible I put this collar on my dog and it completely burnt around his neck where the collar was I'm very disappointed in will never buy this again.

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  • 1 out of 5 stars

    Irritates the skin

    By Kate on Aug 11, 2021

    Doesn't seem too bad on my dog with tons of fur but my baby with short hair was irritated right away. :(

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  • 1 out of 5 stars

    It doesn’t work

    By Seresto on Apr 23, 2021

    Got this as a deterrent for my poor 9 week old baby because he keeps getting fleas and it didn’t work it’s been 2 weeks and he’s still infested. We switched to Seresto and are currently watching them drop dead within hours of putting it on him

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  • 5 out of 5 stars

    It works, I'm glad

    By Mac1 on May 10, 2021

    It does its job like it should. Scent is pleasant and my dogs are tick and flea free.

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  • 5 out of 5 stars

    Satisfied with purchase

    By LDickey on Apr 18, 2021

    Very happy with collar so far. No ticks or fleas to be found and great price

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