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

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$53.99 Autoship Price
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$53.99 Chewy Price
($9.00 /ea)

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Usually arrives in 3-5 days
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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.
  • Protects against heartworms, hookworms, roundworms, and whipworms.
  • SENTINEL FLAVOR TABS does all this with a once-a-month pork, liver-flavored tablets dogs love.

Ingredients

Instructions

FAQ

Learn More About Sentinel From Our Team of Experts
4.8
Rated 4.8 out of 5 stars
2710 Ratings

Customers Mention

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

Ease of Use

92% Positive

Effectiveness

94% Positive

Ingredients

90% Positive

Long-Term Benefits

91% Positive

841 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 Paula on Aug 18, 2025
Harry
Harry

Price

Sentinel is the least expensive proven heart worm prevention by far and also controls fleas at the egg stage and whip worms. Merck is a wonderful company who will

Sentinel is the least expensive proven heart worm prevention by far and also controls fleas at the egg stage and whip worms. Merck is a wonderful company who will talk. to you about anything related to the usage of the meds and your concerns and will pay the vet bills if their product failed your animal. Kudos all around. I won't give my Harry anything else.

By Paula on Aug 18, 2025
Harry
Harry

Rated 5 out of 5 stars
By Bianca on Jan 19, 2025

A safe and effective flea, tick, heartworm for indoor dogs!

Now, I've spent a few years as a kennel tech in a Veterinary Hospital. I know what works. What to look out for. Risks. Sentinel has always been a relatively safe

Now, I've spent a few years as a kennel tech in a Veterinary Hospital. I know what works. What to look out for. Risks. Sentinel has always been a relatively safe brand for all dogs! (Be sure to buy the right weight range!) And it protects very very well! The price is also incredibly affordable thanks to chewy. (If you have a dog who stays mostly outdoors and sentinel has not been doing enough for them, try looking into bravecto's line. It is a bit more expensive but effective.) Thank you Chewy for making my purchase so easy even with my mishaps!

By Bianca on Jan 19, 2025

Rated 5 out of 5 stars
By Cynthia on Aug 5, 2025
Fergie
Fergie

It works

My dog had belonged to my dad. He’s now going on 18. I hand feed him. He’s blind, doggie dementia and occasional incontinence, but he always knows when it’s time

My dog had belonged to my dad. He’s now going on 18. I hand feed him. He’s blind, doggie dementia and occasional incontinence, but he always knows when it’s time to eat. He doesn’t have any problem with the Sentinel. He still gets around like a pup.

By Cynthia on Aug 5, 2025
Fergie
Fergie

Rated 5 out of 5 stars
By Goji on Dec 9, 2021

Great product

As a vet tech for decades, I can say this is my choice in parasite prevention for my dog. For those saying their dog still got fleas, This product does not kill

As a vet tech for decades, I can say this is my choice in parasite prevention for my dog. For those saying their dog still got fleas, This product does not kill or prevent fleas from getting on the dog. The medication in it simply prevents fleas from reproducing. So if you have fleas in the dog’s environment, you need to treat it with a secondary adulticide, as well as treat the environment. If there are no fleas in your dog’s home environment, but happens to pick one up while out on a walk or something, this product will help that or those fleas not turn into thousands. Environment control is a must. What fleas you see on your dog are only 10% of what in the actual environment.

By Goji on Dec 9, 2021

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

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.

By Carmen on Sep 1, 2025
Candy Cane
Candy Cane

Rated 5 out of 5 stars
By Doggiemomma1234 on Sep 8, 2018

Sentinel is great - some info for the one who did not think so

This is a great product and I wanted to respond to the review that reflected a poor score indicating it does not work for fleas. I am sorry that person must have

This is a great product and I wanted to respond to the review that reflected a poor score indicating it does not work for fleas. I am sorry that person must have been lead astray and advised incorrectly to use this product for an active case of fleas. This product should not be used to kill fleas like a Nexguard or Simparica product does. You will notice on the box it says ALSO used to control flea population. The main purpose of Sentinel is heartworm prevention. It will not kill adult fleas; it prevents them from having babies and repopulating, so if you have fleas already you should not use this product to get rid of them. And, I hope a vet did not advise you to. You should use ones like those I previously listed or you may need a capstar which kills all the fleas that are currently on your dog. Good luck but going back to Sentinel it is so great because it is small enough to place in a treat, unlike other alternative heartworm prevention. And, some of my dogs are even able to take it easily without a treat. Most importantly, it works with heartworm prevention!

By Doggiemomma1234 on Sep 8, 2018

Rated 1 out of 5 stars
By Kasey on Apr 13, 2025

Not A Good Medicine

I gave this on the first of the month and it is the 13th of the month and I killed 6 live fleas on my dog. She is sensitive to fleas and chews aggressively when

I gave this on the first of the month and it is the 13th of the month and I killed 6 live fleas on my dog. She is sensitive to fleas and chews aggressively when she gets them so we are diligent with the flea meds. However we wanted to try a cheaper alternative to our normal bravecto. No dice doesn’t even last the month. Very disappointed.

By Kasey on Apr 13, 2025

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

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.

By Kelly on Jan 16, 2026
Holly
Holly

Rated 5 out of 5 stars
By Inge on Jan 1, 2025

Great Product!

I’ve used Sentinel for years and it keeps my pup healthy. He loves the flavor and eats it easily. Chewy makes it so easy to reorder!

I’ve used Sentinel for years and it keeps my pup healthy. He loves the flavor and eats it easily. Chewy makes it so easy to reorder!

By Inge on Jan 1, 2025

Rated 5 out of 5 stars
By Jennifer on Jan 11, 2020

No more worms!

With past pets we have always been a Heartguard clients. With a few rescue's I got a few years ago one of the kids loves to experiment with "goodies" on the ground

With past pets we have always been a Heartguard clients. With a few rescue's I got a few years ago one of the kids loves to experiment with "goodies" on the ground which in turn leads to worms. Sentinel controls Heartworms, Roundworms, Hookworms, Whipworms, Fleas and most importantly less trips to the vet!

By Jennifer on Jan 11, 2020