Hartz UltraGuard Pro Reflecting Flea & Tick Collar for Dogs & Puppies, 1 Collar (7-mos. supply)

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About This Item

Details

  • 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 dogs and puppies 12 weeks of age and older.
  • Water-resistant, continues to fight fleas, protecting your pet no matter the weather.
  • Reflects direct light for up to 450 feet for nighttime safety.
  • Proudly made in the USA of domestic and imported materials to protect your companion from pesky fleas, flea eggs and ticks.

Ingredients

Instructions

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FAQ

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.

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

For more than 95 years, Hartz has been dedicated to creating products that show pets the same unconditional love they give us. Hartz is a leader in quality, innovative products for dogs and cats, including Oinkies, Delectables, UltraGuard, Nature’s Shield, Home Protection, Comfitables, and Groomer's Best brands. Through the Hartz Loving Paws shelter outreach program, Hartz is committed to helping animal welfare organizations that protect and care for pets until they find their forever homes.

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Questions & Answers

21 Customer Questions

How long does it take for the collar to work? And how do i know if its working?

Answer by Chewy • Dec 07, 2018
The collar will begin to kill fleas, ticks and flea eggs and larvae immediately. Its full protections against harder to kill ticks will be built up within a few days after being placed on the pet.

Can this be used on dogs with sensitive skin

Answer by Chewy • Oct 29, 2018
If your dog's skin is sensitive, please ask your veterinarian if this treatment is right for them.

I have 2 cats also. Is this collar safe for my cats if my dog wears it?

Answer by Chewy • Aug 02, 2018
When used as directed this collar is safe to use in multi-pet households.

Does it work for a dog over 130lbs....???

Answer by Chewy • May 09, 2019
This collar is suitable for dogs over 130 pounds.
Reviews
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3.9
Rated 3.9 out of 5 stars
666 Ratings
Terms & Conditions

294 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.

Rated 1 out of 5 stars
By Linda on Dec 29, 2025

Do not use this product!

This Flea and Tick collar has been known to cause the death of dogs. When we found out about this we called Chewy and they recommended that we do NOT use this on

This Flea and Tick collar has been known to cause the death of dogs. When we found out about this we called Chewy and they recommended that we do NOT use this on our dogs. Please do your own research to confirm this. I'm surprised it's still being sold.

Rated 1 out of 5 stars
By Stephanie on Dec 15, 2025

Simple application

Collars were placed on both dogs, after they’d been bathed with a flea treatment. However, despite not having a bad flea issue, the collars aren’t preventing any

Collars were placed on both dogs, after they’d been bathed with a flea treatment. However, despite not having a bad flea issue, the collars aren’t preventing any fleas. Even after 2 weeks of wear.

Rated 5 out of 5 stars
By Robin on Nov 12, 2025

Always good service and always have things in stock

Well, can’t say a whole lot about your products you are extremely high on the Nexxus flea medicine. It’s just crazy, so I’m not gonna pump you up on other things

Well, can’t say a whole lot about your products you are extremely high on the Nexxus flea medicine. It’s just crazy, so I’m not gonna pump you up on other things the prices are too high.

Rated 1 out of 5 stars
By Alyssa on Oct 23, 2025

Not working

Doesn't prevent fleas at all, my dog hasn't ever had fleas because of her collar from a different brand, but I decided to try this brand for the price and she got

Doesn't prevent fleas at all, my dog hasn't ever had fleas because of her collar from a different brand, but I decided to try this brand for the price and she got fleas almost immediately. So now I have to pay to get rid of her fleas too.

Rated 5 out of 5 stars
By Virginia on Sep 25, 2025

Works well!

These flea collars are working well. It seemed to take a couple days to be effective but then I noticed a good change, scratching stopped. think it helped that

These flea collars are working well. It seemed to take a couple days to be effective but then I noticed a good change, scratching stopped. think it helped that I caught the problem early, also. The Chewy rep guided me to them to consider, I appreciated that for the price! (Apply loosely).

Rated 1 out of 5 stars
By Danielle on Dec 17, 2025

Did not work

They have had these on for a while now and they have not worked at all. Didn't even make a slight difference.

They have had these on for a while now and they have not worked at all. Didn't even make a slight difference.

Rated 3 out of 5 stars
By Shannon on Oct 28, 2025

This didn't do much

I don't know if we have super fleas or what. I've used the collar, flea spray, flea shampoo and typical flea treatment and Mango is still covered with fleas.

I don't know if we have super fleas or what. I've used the collar, flea spray, flea shampoo and typical flea treatment and Mango is still covered with fleas.

Rated 3 out of 5 stars
By selena on Dec 18, 2025

no more ticks

i thinki it is working not sure yet but no strong fumes and good fit

i thinki it is working not sure yet but no strong fumes and good fit

Rated 1 out of 5 stars
By Thomas on Sep 3, 2025

Lack of effectivenes.

No matter how much I sprayed my dog, within 10 minutes she was scratching again. This is even after I bathe her and remove any found fleas. I'm sorry, but I feel

No matter how much I sprayed my dog, within 10 minutes she was scratching again. This is even after I bathe her and remove any found fleas. I'm sorry, but I feel this was a waste of money.

Rated 5 out of 5 stars
By Angela on Oct 19, 2025

Just as good ..

In my opinion, this product is just as good as the more expensive brand(s) and lasts just as long

In my opinion, this product is just as good as the more expensive brand(s) and lasts just as long