Sentinel Tablet for Dogs, 11-25 lbs, (Green Box), 6 Tablets (6-mos. supply)

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$53.99 Autoship Price
  • Never miss a dose with easy refills
  • Skip, change, or cancel anytime
$53.99 Chewy Price
($9.00 /ea)

In Stock
FREE delivery
Usually arrives in 3-5 days
Prescription approval made easy
We’ll reach out to your vet clinic.

No interest if paid in full in 6 months on PayPal purchases of $149+. .

Medications ship separately. Delivery times may vary.

About This Item

Details

  • Protects against 5 different kinds of parasites.
  • Unique to SENTINEL brand products, lufenuron prevents flea eggs from hatching.1
  • Protects against heartworms, hookworms, roundworms, and whipworms.1
  • SENTINEL FLAVOR TABS does all this with a once-a-month pork, liver-flavored tablets dogs love.2,3
  • 1SENTINEL SPECTRUM Chews [prescribing information]. Madison, NJ: Merck Animal Health; 2020. 2Data on file. Merck Animal Health. 3SENTINEL SPECTRUM CHEWS [Freedom of Information] NADA #141-333.

Ingredients

Instructions

FAQ

Learn More About Sentinel From Our Team of Experts
4.8
Rated 4.8 out of 5 stars
2584 Ratings

Customers Mention

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

Ease of Use

92% Positive

Effectiveness

93% Positive

Ingredients

89% Positive

Long-Term Benefits

91% Positive

810 Customer Reviews



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 Debra on Mar 31, 2026

Having to insist I sent the Rx from the Vet.

My pets over the last 50 years have been on some sort of Heartworm prevention. I have ordered from Chewy for several of those years and never had an issue. I learned

My pets over the last 50 years have been on some sort of Heartworm prevention. I have ordered from Chewy for several of those years and never had an issue. I learned the routine of ordering. How refreshing it was to be told that the Rx was found after several phone calls. What made it worse was my Vet retired at the end of February and left the country. I could never have replaced this Rx.


Rated 2 out of 5 stars
By Gloria on Mar 15, 2026

The ease of ordering but the delivery was more than subsstandard.

I have been waiting to receive my order. I finally looked at the order status on your website and it stated it was delivered at my front door on the 12th, it is

I have been waiting to receive my order. I finally looked at the order status on your website and it stated it was delivered at my front door on the 12th, it is now the 15th. I use my garage door but have looked out the front door to see if it was delivered . Today I walked out and surveyed the area. I found the package in the garbage container, which I do not use. Its a long stary, but if I order again from Chewy, I will want to talk to a human about the delivery process and expectations.


Rated 5 out of 5 stars
By Holly on Mar 28, 2026

This company is the best!

I am writing this review to brag on Chewy.com in general. I have not had one bad interaction with them. They have been above and beyond helpful every single time

I am writing this review to brag on Chewy.com in general. I have not had one bad interaction with them. They have been above and beyond helpful every single time. I wish every online company could learn from them!


Rated 5 out of 5 stars
By Daniel on Mar 19, 2026

Trusted Repellent

As soon as my Dog could have repellent protection I chose Sentinel as it works & is not harsh on my dog’s system.

As soon as my Dog could have repellent protection I chose Sentinel as it works & is not harsh on my dog’s system.


Rated 5 out of 5 stars
By Jill on Mar 9, 2026

Excellent customer setvice

Sent a condolence card and a hand painted rock in honor of my dog who recently passed away. It meant so much to us!

Sent a condolence card and a hand painted rock in honor of my dog who recently passed away. It meant so much to us!


Rated 5 out of 5 stars
By Kelly on Jan 16, 2026

The Brand To Trust!

My family and I have been using Sentinel for our dogs for over 40 years. We haven't had any issues with Heartworms or the intestinal parasites since we've been using

My family and I have been using Sentinel for our dogs for over 40 years. We haven't had any issues with Heartworms or the intestinal parasites since we've been using this product over the years.


Rated 5 out of 5 stars
By JOANN on Mar 27, 2026

It handles all that I need

It seems to work It was recommended by Dr Mary Alexander at the Lake at Mooresville Vet.

It seems to work It was recommended by Dr Mary Alexander at the Lake at Mooresville Vet.


Rated 5 out of 5 stars
By Jerome on Dec 9, 2025

Customer Service very helpful

The transaction between our vet office and Chewy never seems to go smoothly, I’m guessing they would prefer we purchase our Sentinel from them, your customer service

The transaction between our vet office and Chewy never seems to go smoothly, I’m guessing they would prefer we purchase our Sentinel from them, your customer service jumps through hoops to complete our purchase. To answer the above question, Charlie is Charlotte’s nickname we only have one lemon beagle.


Rated 5 out of 5 stars
By Shawn on Jan 31, 2026

Quick response on correction of order

I corrected the pet name and Chewy was quick to get the corrected prefer to the vet and then shipped to us before time for his monthly pill.

I corrected the pet name and Chewy was quick to get the corrected prefer to the vet and then shipped to us before time for his monthly pill.


Rated 5 out of 5 stars
By Barbara on Mar 15, 2026

Can count on Chewy

Chewy automatically sends Peanut’s meds so I don’t have to worry about him missing a dose.

Chewy automatically sends Peanut’s meds so I don’t have to worry about him missing a dose.