Sentinel Tablet for Dogs, 26-50 lbs, (Yellow Box), 6 Tablets (6-mos. supply)

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$60.99 Autoship Price
  • Never miss a dose with easy refills
  • Skip, change, or cancel anytime
$60.99 Chewy Price
($10.17 /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
1414 Ratings

Customers Mention

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

Ease of Use

95% Positive

Effectiveness

93% Positive

Ingredients

93% Positive

Long-Term Benefits

94% Positive

428 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 Isabella on Jan 6, 2026

it works!

I was happy to find something that was effective and affordable. My female dog(45lbs, 1 year) has been taking these since she was old enough and we haven't had any

I was happy to find something that was effective and affordable. My female dog(45lbs, 1 year) has been taking these since she was old enough and we haven't had any signs of what it treats since starting. Please note, she has all her shots and got all her puppy treatments prior!


Rated 5 out of 5 stars
By Gail on Dec 23, 2025

Used this for years with several dogs

Great results! Recently tried one of the newer products with terrible results for my Bichon: bad tremors. Switched back to this product and tremors disappeared

Great results! Recently tried one of the newer products with terrible results for my Bichon: bad tremors. Switched back to this product and tremors disappeared. Guess I will stick with the oldie but goodie.


Rated 4 out of 5 stars
By Elaine on Nov 19, 2025

Not a Chewy

Since Muffin will eat anything, she's a beagle, this wasn't an issue. I don't even have to coat a pill. But for pickier dogs, this my be an issue. The previous ones

Since Muffin will eat anything, she's a beagle, this wasn't an issue. I don't even have to coat a pill. But for pickier dogs, this my be an issue. The previous ones from the same pharmaceutical were chews.


Rated 5 out of 5 stars
By Mark on Dec 28, 2025

Good price and have the product!

Vet does not deal with Sentinel anymore, but can get direct from Chewy with prescription. Happy they carry it at a good price.

Vet does not deal with Sentinel anymore, but can get direct from Chewy with prescription. Happy they carry it at a good price.


Rated 4 out of 5 stars
By Cynthia on Sep 28, 2025

Convenience

My dog has used this item her whole life. The order was processed and shipped promptly as usual. I ordered this a month early because of an email dated 09/03/2025

My dog has used this item her whole life. The order was processed and shipped promptly as usual. I ordered this a month early because of an email dated 09/03/2025 offering $20 off your pharmacy order of $49 or more. The prescription cost $60.99 but the code of RXFALL20 was not honored for the order. Not sure why this item was not covered for the discount. I did not take the time to call regarding the issue.


Rated 3 out of 5 stars
By Kathy on Oct 18, 2025

The sentinel itself is great but..

I would’ve gave five stars if they had a better system for getting prescriptions to them. My vet will not fax anything so I need to go the prescription and then

I would’ve gave five stars if they had a better system for getting prescriptions to them. My vet will not fax anything so I need to go the prescription and then send it through the mail which takes forever for chewy to get it and acknowledge that they got it.


Rated 5 out of 5 stars
By Aryeh on Nov 18, 2025

Fast turn around

I’ve had issues before with other companies ordering this med, but Chewy was fast and I got it when I needed. Thanks!

I’ve had issues before with other companies ordering this med, but Chewy was fast and I got it when I needed. Thanks!


Rated 5 out of 5 stars
By Eileen on Oct 26, 2025

Most reliable brand out there!

I have used Sentinel for ALL my dogs for YEARS. I have never had to treat them for any of the things that Sentinel is a preventative of. Great brand!

I have used Sentinel for ALL my dogs for YEARS. I have never had to treat them for any of the things that Sentinel is a preventative of. Great brand!


Rated 4 out of 5 stars
By Joe on Oct 15, 2025

Always good service from you...fast & correct!

Handles it well. Only negative is this new requirement from local vet to obtain/send you a hardcopy 'script. Seems unnecessary...but...not your fault!

Handles it well. Only negative is this new requirement from local vet to obtain/send you a hardcopy 'script. Seems unnecessary...but...not your fault!


Rated 3 out of 5 stars
By Sharon on Jan 3, 2026

Still not a well received medication.

My dog would not eat it. I had to chop it up and mix it in with her food.

My dog would not eat it. I had to chop it up and mix it in with her food.