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

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$50.99 Autoship Price
  • Never miss a dose with easy refills
  • Skip, change, or cancel anytime
$50.99 Chewy Price
($8.50 /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
2456 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

90% Positive

779 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 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 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 Cindy on Jan 20, 2026

Great coverage

This product works well to keep my miniature schnauzer protected. I've been using it for years.

This product works well to keep my miniature schnauzer protected. I've been using it for years.


Rated 5 out of 5 stars
By Joanne on Dec 26, 2025

HEARTWORM MEDS..

Quick delivery, so I didn't have to worry about getting it.. Was sent a reminder that it was coming, so no need to worry..

Quick delivery, so I didn't have to worry about getting it.. Was sent a reminder that it was coming, so no need to worry..


Rated 5 out of 5 stars
By Dr. on Jan 2, 2026

My pets have died.

All of my pets are dead. Missy died last week. Priscilla died three weeks ago. I have no cats or dogs. Sad time.

All of my pets are dead. Missy died last week. Priscilla died three weeks ago. I have no cats or dogs. Sad time.


Rated 5 out of 5 stars
By Jane on Jan 14, 2026

Sentinel

Our dogs have been taking these all their lives. We've never had any problem with the product.

Our dogs have been taking these all their lives. We've never had any problem with the product.


Rated 5 out of 5 stars
By Carmen on Sep 1, 2025

Save me the trouble of sending in the script and fastDelivery

I have on my calendar scheduled to remind me to order my dog medicine. Before I knew it I received a notice to order and received the order. I don't remember putting

I have on my calendar scheduled to remind me to order my dog medicine. Before I knew it I received a notice to order and received the order. I don't remember putting it on auto. I always get the 6 months supply and I have to get script from the vet when I take her for her 6 months check up. She has to have to be in daycare. I know, but I have to go to work and leaving her home with no activity make her very active when I get home/walking. But having chewy to contact her vet and fill the script is one thing off my mind and the delivery is fast. Thanks Chewy.


Rated 5 out of 5 stars
By Elaine on Oct 22, 2025

Heartworm protection

I was very pleased with this product. I have used it for a long time and have not had a heartworm problem. Also, I don't have to fight with my puppies to get them

I was very pleased with this product. I have used it for a long time and have not had a heartworm problem. Also, I don't have to fight with my puppies to get them to chew it because it has a pleasant flavor.


Rated 5 out of 5 stars
By Wendy on Nov 7, 2025

Good as always

Works very well for my dogs and Chewy is super fast delivery as always. My dogs know when the deliveries are for them, like the commercial, Peanut Butter box is

Works very well for my dogs and Chewy is super fast delivery as always. My dogs know when the deliveries are for them, like the commercial, Peanut Butter box is here.


Rated 5 out of 5 stars
By Marcia on Nov 23, 2025

Have always been satisfied with my shipments and how quickly they arrive.

All of CoCo's shipments have been for medication. She is a senior dog and doesn't play with toys. Nothing amazing about medication!!

All of CoCo's shipments have been for medication. She is a senior dog and doesn't play with toys. Nothing amazing about medication!!