Sentinel Spectrum Chew for Dogs, 25.1-50 lbs, (Yellow Box), 6 Chews (6-mos. supply)

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$67.99 Autoship Price
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$67.99 Chewy Price
($11.34 /ea)

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FREE delivery
Usually arrives in 3-5 days
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Medications ship separately. Delivery times may vary.

About This Item

Details

  • Protects against 6 different types of parasites, including tapeworms.
  • Unique to SENTINEL brand products, lufenuron stops flea eggs from hatching.1
  • Protects against heartworms, tapeworms, hookworms, roundworms, and whipworms.1
  • SENTINEL SPECTRUM does all this with convenient and effective once-a-month dosing and a soft beef and bacon-flavor?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 Spectrum From Our Team of Experts
4.8
Rated 4.8 out of 5 stars
873 Ratings

Customers Mention

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

Ease of Use

93% Positive

Effectiveness

93% Positive

Ingredients

89% Positive

Long-Term Benefits

94% Positive

293 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 Shana on Oct 19, 2025

Peace of Mind

Teddy has been taking this since a pup. It is pricey, but peace of mind. It’s priceless.. He always has a clean bill of health. Now he is a geriatric pup going

Teddy has been taking this since a pup. It is pricey, but peace of mind. It’s priceless.. He always has a clean bill of health. Now he is a geriatric pup going to his first geriatric appointment on Monday. Thank you, Centennial spectrum for keeping my dog healthy. My son had told the new groomer to cut him even all over. He’s a soft coat. Did Wheaton terrier and has never been so bald. He’s rocking it, though loving on my geriatric pup

By Shana on Oct 19, 2025

Rated 5 out of 5 stars
By Shirley on Apr 17, 2026
Pepper
Pepper

Heartworm Negative!

My girl Pepper was on this for a full year after transitioning from another brand and it definitely worked because she was heartworm negative at her wellness check

My girl Pepper was on this for a full year after transitioning from another brand and it definitely worked because she was heartworm negative at her wellness check and the vet did a blood panel.

By Shirley on Apr 17, 2026
Pepper
Pepper

Rated 5 out of 5 stars
By Anne on Aug 25, 2024

Maeve is. Now a big girl

At first I had to break the med in half, but now no problem, she takes it with ease and she likes it. I have had other dogs that I broke it in half and they some

At first I had to break the med in half, but now no problem, she takes it with ease and she likes it. I have had other dogs that I broke it in half and they some time spit it out put it in a piece of cheese and no problem. Now with this little girl no problem. Maybe if flavored with a meat flavor or cheese flavor may work for other dogs with a problem.

By Anne on Aug 25, 2024

Rated 5 out of 5 stars
By Triscuit on Aug 30, 2019

Best overall protection

I’ve tried a few different pills for my dog and this one works the best overall. Sentinel Spectrum doesn’t have the strongest flea protection but it has what no

I’ve tried a few different pills for my dog and this one works the best overall. Sentinel Spectrum doesn’t have the strongest flea protection but it has what no other protections do. Tapeworm protection. My dog loves to play in dirt and sometimes will eat dirt to get attention so we’ll chase him to make him stop, he likes being chased. *weird I know* Fleas and flea eggs can be found in dirt and he would occasionally get tape worms. Its more costly and lengthly a process to deworm your dog. Even with vet help it takes a few days for them to clear out completely. Having him on spectrum thats not been an issue and its been almost 3 years. There’s a lot of 30 mins flea killers so we supplement that maybe 3 times a year with spectrum and hes fully covered. Looking at monthly heartworm prevention comparison charts this one is top ranked for best overall coverage AND being unique for dealing with tapeworms. Thank you spectrum!

By Triscuit on Aug 30, 2019

Rated 5 out of 5 stars
By Annette on Feb 5, 2025

Customer service

I ordered the wrong product. I contacted customer support and they answered on the first ring, very friendly and very helpful. She even asked how my other dogs were

I ordered the wrong product. I contacted customer support and they answered on the first ring, very friendly and very helpful. She even asked how my other dogs were doing and I told her my 16 yo crossed the rainbow bridge. The next day we had a fresh flower arrangement with a sympathy card. We will always use and recommend Chewy for being so thoughtful and caring!

By Annette on Feb 5, 2025

Rated 5 out of 5 stars
By Elaine on Jul 16, 2024

No hiccups, no extra charges

I had added some items to my auto shipment of this item. But since Muffin had gained a few pounds, the vet didn't approve the original auto shipment for up to 25

I had added some items to my auto shipment of this item. But since Muffin had gained a few pounds, the vet didn't approve the original auto shipment for up to 25 lb dogs. So my vet called to explain and said the next higher prescription would be better. Chewy added the higher dosage, but that meant I had two shipments. I was wondering if a robot would charge shipping for the other small items I added. But I was very pleased that either a smart robot or humans were in charge in accounting. No extra charge ! Good job!

By Elaine on Jul 16, 2024

Rated 5 out of 5 stars
By onedoggie on Apr 25, 2019

Heartworm protection

Not being satisfied with the options provided by our vet, I sought to use a heartworm preventative which had been provided by a previous vet. I chose Sentinel Spectrum

Not being satisfied with the options provided by our vet, I sought to use a heartworm preventative which had been provided by a previous vet. I chose Sentinel Spectrum which provides protection also against intestinal parasites as well as fleas, ticks and heartworm. Einstein is fearless and will go out in all sorts of weather, so a topical application is not a satisfactory option.

By onedoggie on Apr 25, 2019

Rated 5 out of 5 stars
By Dane on Nov 8, 2018

Protect your dogs!

I HAVE FOUND THIS TO BE THE BEST FLEA AND TICK MED FOR BOTH OF MY DOGS. I GIVE IT MONTHLY, AND THEN EVERY THREE MONTHS I GIVE IT WITH BRAVECTOL. (CALL IT THE "DOUBLE

I HAVE FOUND THIS TO BE THE BEST FLEA AND TICK MED FOR BOTH OF MY DOGS. I GIVE IT MONTHLY, AND THEN EVERY THREE MONTHS I GIVE IT WITH BRAVECTOL. (CALL IT THE "DOUBLE WHAMMY!) I HAVE NEVER SEEN A TICK OR FLEA ON THEM AND THEY HAVE VERY LITTLE SIDE EFFECTS FROM IT.

By Dane on Nov 8, 2018

Rated 5 out of 5 stars
By Cate on Feb 13, 2020

Works well and is safe for my Aussie

I was recommended this by other friends of mine with Australian Shepherds. My girl is only 7 months old. Because of their sensitivities and genetics, Aussies can

I was recommended this by other friends of mine with Australian Shepherds. My girl is only 7 months old. Because of their sensitivities and genetics, Aussies can be prone to reactions to certain meds. I was cautious and skeptical of certain heartworm / flea and tick meds. This one is friendly to my Aussie and has not caused any adverse side effects or behavior changes in my doggo. Have not found any bugs on her ever (and I live in the south), and she also seems to love how they taste.

By Cate on Feb 13, 2020

Rated 5 out of 5 stars
By Nancy on Jan 28, 2025

Excellent product.

My Shelties have used Sentinel for years and I have had no problems with it.

My Shelties have used Sentinel for years and I have had no problems with it.

By Nancy on Jan 28, 2025