Sentry FiproGuard Flea & Tick Spot Treatment for Dogs, 89-132 lbs, 3 Doses (3-mos. supply)

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About This Item

Details

  • The active ingredient is Fipronil, a powerful chemical used in leading tick medications.
  • Treatment kills adult fleas and ticks and protects against chewing lice.
  • Use on your favorite puppy eight weeks and older.
  • Stop the flea life cycle and kill flea eggs and flea larvae for up to 12 weeks.
  • Apply this treatment for relief that is fast acting, long-lasting, and waterproof.

Ingredients

Instructions

FAQ

Learn More About Sentry 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.

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Questions & Answers

2 Customer Questions

This isn’t prevention?

Answer by Chewy • Jan 26, 2021
This treatment kills fleas, flea eggs, flea larvae, ticks and chewing lice for up to 30 days. It breaks the flea life cycle by killing flea eggs and larvae and kills ticks that may transmit Lyme disease.

What are the ingredients?

Answer by Chewy • Oct 15, 2018
The treatment contains Fipronil as an active ingredient.
Reviews
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4.0
Rated 4 out of 5 stars
110 Ratings
Terms & Conditions

Customers Mention

Chewy identifies key considerations with the help of artificial intelligence and our veterinarians.

Ease of Use

73% Positive

Effectiveness

73% Positive

Ingredients

72% Positive

Long-Term Benefits

67% Positive

71 Customer Reviews

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

Rated 2 out of 5 stars
By Jacqueline on Nov 16, 2025

Not very effective

Wanted to try something different and it definitely did not work and leaves a white powdery cast on my black dogs backs.

Wanted to try something different and it definitely did not work and leaves a white powdery cast on my black dogs backs.

Rated 5 out of 5 stars
By Laura on May 25, 2025

Good product!

I have an American Pitbull, and this stuff works very well on him. I have not seen him have any side effects while using this product, and It works really well on

I have an American Pitbull, and this stuff works very well on him. I have not seen him have any side effects while using this product, and It works really well on ticks.

Rated 5 out of 5 stars
By Patricia on Apr 14, 2025

Same as at the farm supply store

Well packaged, fast shipping! Cheaper than local farm supply store with a veterinary section. And exactly the same product. My veterinarian was out of it, and so

Well packaged, fast shipping! Cheaper than local farm supply store with a veterinary section. And exactly the same product. My veterinarian was out of it, and so was I. Now I'll always reorder from Chewy. PS: my dog JR knows the peanut butter boxes are for him!

Rated 3 out of 5 stars
By Kathy on Jun 26, 2025

Less expensive

My pet thinks you should give him more time. He ordered ahead of time and we have no input yet.

My pet thinks you should give him more time. He ordered ahead of time and we have no input yet.

Rated 1 out of 5 stars
By Troy on May 16, 2025

DOESN'T APPEAR TO HAVE ANY EFFECT ON MY TWO DOGS WHAT SO EVER!

Applied according to directions. Two days later. BOTH were still scratching and acting as if nothing was applied.

Applied according to directions. Two days later. BOTH were still scratching and acting as if nothing was applied.

Rated 1 out of 5 stars
By Tamara on Dec 17, 2024

It seemed to have stopped working

For three months even with Capstar my dogs had continuous scratching with dermatitis. Almost as if they'd built a resistance or the product was just not workin

For three months even with Capstar my dogs had continuous scratching with dermatitis. Almost as if they'd built a resistance or the product was just not working

Rated 2 out of 5 stars
By Sarah on Oct 13, 2024

Works for ticks

This started out at the beginning of the year working for fleas and ticks. But please somehow became immune to it and I had to switch to something else. It did help

This started out at the beginning of the year working for fleas and ticks. But please somehow became immune to it and I had to switch to something else. It did help to keep ticks off the dogs in a very forested area.

Rated 5 out of 5 stars
By Shirley on Dec 3, 2024

Easy to use

We won't be buying this anymore. Star has passed and not because of this flea med.

We won't be buying this anymore. Star has passed and not because of this flea med.

Rated 5 out of 5 stars
By Eurie on Dec 4, 2024

Flea meds

I have used this product for years. It's the only one I use

I have used this product for years. It's the only one I use

Rated 1 out of 5 stars
By Autumn on Aug 16, 2024

Don’t buy

My dog had a terrible allergic reaction. Constantly itching and eventually his legs started swelling. The vet had to give him antihistamines.

My dog had a terrible allergic reaction. Constantly itching and eventually his legs started swelling. The vet had to give him antihistamines.