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

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

By Hartz
Rated 3.2742 out of 5 stars
$4.30Chewy Price
$4.08Autoship Price
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About This Item


  • 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.

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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.

Questions & Answers

6 Customer Questions

is this ok for a 13 wk old puppy?
Answer by ChewyJan 02, 2022
This collar is suitable for all puppies above 12 weeks of age.

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.

ReviewsWrite a Review

Rated 3.2742 out of 5 stars
62 Reviews
Would recommend to a friend

62 Customer Reviews

Filter by reviews that mention

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 4 out of 5 stars
By JayE on Mar 26, 2023

Ultra guard

Seems to work, second time purchase.Hopefully the formula does not change and it keeps working.

Rated 1 out of 5 stars
By dinak on Aug 23, 2022

steer clear -- dog & I are both seem to be allergic

Yikes. First, the smell is incredibly overpowering and permeates every area the poor pup goes. I found just the smell to be incredibly irritating to my eyes and sinuses and even to my hands when I wasn't touching the collar or dog. At night I couldn't even roll to face the side of the room where the dog was without being overwhelmed by the smell and having sinus and eye reactions. I gave it a few days to see if it would settle down -- it did a bit by the end of the 3rd day but by then my puppy (15 weeks) was scratching like crazy and I finally realized she was having an allergic reaction too. Took it right off, took her swimming, then gave her a bath, and finally no itching. Poor girl. I absolutely do NOT recommend this collar.

Rated 5 out of 5 stars
By Cookie86 on Oct 21, 2022

these work great

I buy these for my dog because I give her Revolution and it doesn't cover all ticks, so my vet told me to buy these and my dog has not got any ticks since. I like that it is reflective and a great price

Rated 1 out of 5 stars
By Sianna2020 on Nov 18, 2022

Flea treatment

This stuff is garbage. My animals still have flea's even with the flea collars.

Rated 2 out of 5 stars
By Hailey on Jun 17, 2022

Doesn’t seem to help

Barely helps, she’s still non stop scratching. The only time she isn’t scratching is when she’s on the 30 day flea pill I’ve got her. It does good for her!

Rated 5 out of 5 stars
By Missy on Jul 6, 2022

My babies love Chewy!!

I love chewy. You order something and it arrives within 2-3 days. They also have a large variety of items.

Rated 5 out of 5 stars
By Carla on May 25, 2022

Very quick relief.

These always work well. I have used them forever, however this was the first time buying from Chewy. As usual, Chewy came through like the champs they are.

Rated 2 out of 5 stars
By TinaM on Feb 15, 2022

Flea Guard

I have used this product on my in doors and out stray. It use to work well .However I noticed last summer and even now in winter it is NOT WORKING . Not sure what they did to product .Hopefully they fix it before spring with all the bad reviews .. Or I will not purchase again ..

Rated 3 out of 5 stars
By ScrapDoo on Nov 27, 2021

Allergic reaction?

So when I put this on my small dog, a few days later, he started breaking out in red, dime sized spots all over his stomach and chest. When I took the collar off, they went away. I never got a chance to see if the collar actually worked for fleas because I didn't want to leave it on him. It could just be a personal allergic reaction but just beware...

Rated 5 out of 5 stars
By Lacey on Jul 22, 2021

Great choice for my beagle

I noticed an immediate difference within two days of putting this on my beagle. My beagle is prone to allergies and if he gets fleas, it makes things worse. This collar has proven to be effective and I haven't seen him scratching like he was after we would go on our walks/hikes. There isn't a strong odor and it doesn't seem to bother him. I also love that it is able to get wet and remain effective. My beagle loves swimming and he can still wear this collar and get in the pool with us without having to remove it. The dual buckle system makes sure the collar stays on and it isn't difficult to use. I'm happy with this choice of flea and tick prevention for my beagle! I received this product at a discount in exchange for my honest opinion.