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

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$64.99 Autoship Price
  • Never miss a dose with easy refills
  • Skip, change, or cancel anytime
$64.99 Chewy Price
($10.84 /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 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
759 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

94% Positive

259 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


Rated 5 out of 5 stars
By Kelly on Dec 18, 2025

Terrific Product

My dog has been on this formula of Sentinel Spectrum for 2 years and is doing great! Thank you to Chewy for such friendly and fast service!

My dog has been on this formula of Sentinel Spectrum for 2 years and is doing great! Thank you to Chewy for such friendly and fast service!


Rated 5 out of 5 stars
By Martha on Nov 26, 2025

Effective

All my dogs have been on Sentinal Spectrum for more than 20 years. We have never had problems with ticks, fleas, worms of all types or heartworms

All my dogs have been on Sentinal Spectrum for more than 20 years. We have never had problems with ticks, fleas, worms of all types or heartworms


Rated 5 out of 5 stars
By Maureen on Dec 20, 2025

Chewable

Bandit loves his chewable heart preventative. He thinks it is a treat when I give it to him every month.

Bandit loves his chewable heart preventative. He thinks it is a treat when I give it to him every month.


Rated 5 out of 5 stars
By JOSEPH on Oct 29, 2025

Chewable makes it easier to give to my dog.

I have a Dachshund/beagle mix and had been having trouble with the hind legs. He’s been on these pills for a year and it’s made a big difference

I have a Dachshund/beagle mix and had been having trouble with the hind legs. He’s been on these pills for a year and it’s made a big difference


Rated 5 out of 5 stars
By Denise on Dec 20, 2025

The speedy response

The people at chewy always make ordering my pet's prescriptions fast and easy.

The people at chewy always make ordering my pet's prescriptions fast and easy.


Rated 4 out of 5 stars
By Isabelle on Sep 4, 2025

It is a chewable

Well, Charles will eat anything, but this chewable must not taste really great because he is hesitant at first, but it’s “food” , so he eats it.

Well, Charles will eat anything, but this chewable must not taste really great because he is hesitant at first, but it’s “food” , so he eats it.


Rated 3 out of 5 stars
By charles on Sep 9, 2025

Did not like the taste

My picky Dobie, Ruby would not eat the chewable pill. I had to hide it in a meatball. Otherwise she tolerated the medication fine

My picky Dobie, Ruby would not eat the chewable pill. I had to hide it in a meatball. Otherwise she tolerated the medication fine


Rated 5 out of 5 stars
By Donna on Sep 26, 2025

Spectrum

Chewy contacts our dog’s vet for prescription authorization which makes the auto ship that much easier.

Chewy contacts our dog’s vet for prescription authorization which makes the auto ship that much easier.


Rated 2 out of 5 stars
By Timothy on May 22, 2025

No notification when my order was not shipped.

I ordered 2 products that I had previously ordered. Because I ordered the wrong version of a medication, my vet rejected it. I was never notified by Chewy and it

I ordered 2 products that I had previously ordered. Because I ordered the wrong version of a medication, my vet rejected it. I was never notified by Chewy and it appeared it had been charged to my credit card (it was only on hold). Was never notified it was rejected. If I would not have called my pet would not have had the meds to take on a timely basis. This should be an automatic notification in your system when any order is rejected and not shipped, especially a prescription medication.