Sentinel Tablet for Dogs, 26-50 lbs, (Yellow Box)

By Sentinel
Rated 4.5482 out of 5 stars
Prescription Item

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$60.99Chewy 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.

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 guards against heartworms, adult roundworms, adult hookworms, whipworms, and prevents the development of flea eggs. It protects your dog against heartworm disease and intestinal worms, all in a palatable, 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

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ReviewsWrite a Review

Rated 4.5482 out of 5 stars
166 Ratings
Would recommend to a friend

155 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 Peggy on Nov 24, 2023

Very Helpful

I'm on autoship for heart worm medicine for my 2 dogs. Their prescription had expired and Chewy sent the vets office notice and then called when they hadn't gotten a speedy response. Pills received on time. Thank you.

Rated 5 out of 5 stars
By Patricia on Nov 17, 2023

Sentinel Tablet for Dogs, 26-50 lbs, (Yellow Box)

Its easy to give and keeps the fleas and heartworms at bay. I feel good making sure my kids are safe from these critters that can do so much harm.

Rated 4 out of 5 stars
By pedro on Nov 3, 2023


i been giving this product that a lot of my friends with dogs had recommended and i tried on my dog but so far he still have some fleas sny other product i could use ?

Rated 2 out of 5 stars
By Lori on Nov 22, 2023

Not sure if it’s the Sentinel causing the excessive itching on my dog, but ever since we gave it to him, he has been Irving excessively.

Rated 5 out of 5 stars
By Cathy on Oct 26, 2023

yes, yes, yes

This pill is easier to dip in the gravy part of his food, (compared to the big vet sold pill "treat"- that he doesn't like) so he eats the pill. He other wise will spit it out.

Rated 5 out of 5 stars
By Fred on Sep 30, 2023

Chewy Professionalism

Been using Sentinel for 14 + years with our Boarder Collie/Mix. No matter who you speak with @ Chewy they are very friendly, professional and understanding. I do as much as possible of my "Pets'" foods and Rx as possible with Chewy.

Rated 5 out of 5 stars
By Susan on Aug 4, 2023

Works great without side effects

I've used Sentinel for my Molly for 12 yrs. She's very sensitive to different products so I try to stay with the ones I've tried already without reactions. My vet recommended Sentinel Plus a few yrs ago & stopped carrying the original Sentinel, so I opted for a prescription to send into Chewy. I'm so happy Chewy stocks the original Sentinel so my Molly is protected without side effects or unwanted issues.

Rated 5 out of 5 stars
By PAUL on Nov 4, 2023


Our dog was already on Sentinel when she adopted us, we just continued. No problems, no side effects.

Rated 5 out of 5 stars
By Setty1 on Oct 19, 2023

Heartworm Tablet

My pup is tolerating the Sentinel tablet much better than previous chewable Heartworm tablet.

Rated 5 out of 5 stars
By Laura on Nov 11, 2023


Smooth transaction this time after heartworm test at Vet.