Sentinel Tablet for Dogs, 51-100 lbs, (White Box)

By Sentinel
Rated 4.583 out of 5 stars
Prescription Item

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$72.99Chewy Price

In Stock
FREE delivery
Usually arrives in 3-5 days
We'll collect your pet's prescription information at Checkout.

This item requires prescription approval.

Medications ship separately. Delivery times may vary.

Frequently Bought Together

NexGard Chew for Dogs, 60.1-121 lbs, (Red Box), 6 Chews (6-mos. supply)
Rated 4.5831 out of 5 stars
$139.99Chewy Price
Total Price: $281.98

About This Item


Your furry friend must have a current heartworm test result on file with your veterinarian in order to be prescribed heartworm medication. Please visit your veterinarian to have this test performed annually to protect your four-legged friend. Sentinel is a monthly oral preventive prescription that protects your pet against heartworms, adult roundworms, adult hookworms, whipworms and prevents the development of flea eggs. Best of all, this medication may also help protect your pal against heartworm disease and intestinal worms, all in a tasty, flavored tablet.

Proudly sourced directly from the manufacturer or their approved distributor. Guaranteed genuine and backed by the manufacturer.

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Play Video: Learn More About Sentinel From Our Team of Experts
Learn More About Sentinel From Our Team of Experts

ReviewsWrite a Review

Rated 4.583 out of 5 stars
223 Ratings
Would recommend to a friend

222 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.
Rated 5 out of 5 stars
By JujuB on Sep 2, 2023

Reliable for 25 Years!

I have been using this Sentinel product on all my dogs for 25 years! Seven dogs total (with two currently using) and none have ever tested positive for heartworm disease or parasites & have never had fleas. I used to wrap the table in cheese, but with current two I crush it & mix it in a meal. The best product I have ever used and will continue to use. It is also cost effective which is a plus!

Rated 5 out of 5 stars
By MrLopez on Aug 29, 2023

One & Done

This is the perfect product to keep your pup healthy have used this for multiple dogs over the years with no problems. Once a month and you have a happy healthy pup.

Rated 5 out of 5 stars
By Lori on Aug 19, 2023

Glad to have the medicine available for Riley. I will be away and I give it a him the first of the month. I don’t want to scramble and or miss.

Rated 5 out of 5 stars
By Ric on Jun 24, 2023

Great price/fast shipping!

This is the same Sentinel my vet prescribes for my Husky except it's $40 less for a year's supply at Chewy. I had some questions about the product so I called customer service. Extremely nice and very accommodating!

Rated 2 out of 5 stars
By Mary on Jul 13, 2023

Not very effective

My dog is still getting lots of flea bites. Maybe a few less than before the medication, but I was expecting complete flea control. Disappointed.

Rated 1 out of 5 stars
By Sparky on Apr 7, 2023

something has changed

After using this med for 17 yrs on all of my dogs, something has changed! I couldn’t figure out what was going on with my pup last Dec, but something was wrong! Took him to the vet and was totally floored to find out my pup was allergic to what my vet called “baby fleas!” It was freezing outside! Where would an inside dog, who only goes out to potty, get fleas in subzero temps? He had been taking Sentinel for over 4 yrs and never had a flea issue before! Either the fleas developed a resistance to the med, or something has changed with the med! Switched him to a different med, which is much more expensive, but that solved the problem!

Rated 5 out of 5 stars
By rafa on Aug 24, 2023

sentinel rx

easy to use, no problems with refusal from the dog no side effects good product....

Rated 4 out of 5 stars
By Batya on Jul 28, 2023

Good but...

Product arrived quickly but was disappointed that manufacturer wouldn't allow rebate because purchased online.

Rated 3 out of 5 stars
By Customer on May 5, 2023

Read the fine print

Vet recommended. So far so good. Excellent rebates when purchased in conjunction with other Merck Animal Health products. However, as I just learned, Merck will not honor rebates for product purchased from Chewy. Merck is adamant. Chewy told me to talk to Merck. Good bye rebate.

Rated 5 out of 5 stars
By Sandi on Jun 3, 2023
Top 1000 Contibutor

Works great!

I have been buying this since 1997 for all of my dogs to protect against Heartworm and fleas. Its easy, works great and I have never seen one flea....