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

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About This Item

Details

  • 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.

Ingredients

Instructions

Size

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

5 Customer Questions


Do the fleas fall off and die ?

Answer by ChewyNov 24, 2019
This collar is designed to kill and repel fleas, deer and brown dog ticks for 7 months.

Will it take care of the flea larvae?

Answer by ChewyNov 12, 2021
This collar kills adult fleas and ticks.

how long will the first one kill and keep fleas off my dogs?

Answer by ChewyMay 12, 2021
This collar provides a 7 month protection against fleas and ticks.

can or should this collar be used with another flea protection hartz product

Answer by ChewyAug 04, 2021
Do not use this collar on dogs simultaneously or within 30 days before or after treatment with or exposure to pesticides, chemicals or cholinesterase inhibiting drugs.

3.9
Rated 3.9 out of 5 stars
298 Ratings

118 Customer Reviews



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

Rated 3 out of 5 stars
By Krystal on Jan 2, 2026

Dog Collar

Better than a vet visit but I don't know if it really works for up to 7 months. It's worth a try.

Better than a vet visit but I don't know if it really works for up to 7 months. It's worth a try.


Rated 5 out of 5 stars
By Nicole on Dec 16, 2025

Hartz flea collar

This dog collar smells amazing! Rocky Green out of his after about 2 mins so I will be buying a new one come spring

This dog collar smells amazing! Rocky Green out of his after about 2 mins so I will be buying a new one come spring


Rated 1 out of 5 stars
By Josi on Aug 7, 2025

Avoid. Made all 3 dogs sick.

Day 2 of wearing collars & all 3 of my dogs were vomiting & had diarrhea. Symptoms cleared for all 3 after removing collars by the next day. Avoid if possible. Other

Day 2 of wearing collars & all 3 of my dogs were vomiting & had diarrhea. Symptoms cleared for all 3 after removing collars by the next day. Avoid if possible. Other users have reported much worse.


Rated 1 out of 5 stars
By Tina on Oct 24, 2025

Doesn’t work

Iv had it on my pug for almost it does not work he still scratching just terrible

Iv had it on my pug for almost it does not work he still scratching just terrible


Rated 1 out of 5 stars
By Christin on Oct 30, 2025

Total waste of money.

This collar is inexpensive and ineffective! Don’t waste your time.

This collar is inexpensive and ineffective! Don’t waste your time.


Rated 5 out of 5 stars
By Jeremy on Jan 5, 2026

We have used them in the past

It has been helping with the fleas

It has been helping with the fleas


Rated 5 out of 5 stars
By Anna121 on Nov 17, 2025

Harts Ultra guard flee and tick product

This product worked immediately and made them happy

This product worked immediately and made them happy


Rated 1 out of 5 stars
By Cameron on Oct 19, 2025

It's useless

I didn't find this brand of flea collars to be actually helpful

I didn't find this brand of flea collars to be actually helpful


Rated 1 out of 5 stars
By CB on Aug 16, 2025

Does not work!

I had the collar on since I bought it, and buddy scratches more than he did before on his whole body

I had the collar on since I bought it, and buddy scratches more than he did before on his whole body


Rated 1 out of 5 stars
By Dylan on Aug 1, 2025

Seizures

They making my dog have seizures when I looked it up they are under a law suit

They making my dog have seizures when I looked it up they are under a law suit