Sentinel Spectrum Chew for Dogs, 50.1-100 lbs, (Blue Box), 6 Chews (6-mos. supply)

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$77.99 Autoship Price
  • Never miss a dose with easy refills
  • Skip, change, or cancel anytime
$77.99 Chewy Price
($13.00 /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

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Reviews
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4.8
Rated 4.8 out of 5 stars
1405 Ratings
Terms & Conditions

Customers Mention

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

Ease of Use

95% Positive

Effectiveness

90% Positive

Ingredients

87% Positive

Long-Term Benefits

90% Positive

446 Customer Reviews

Always consult a veterinarian about your pet’s health needs. Customer reviews should not be used as medical advice.

Rated 1 out of 5 stars
By Catherine on Jan 27, 2026

Excellent service except

Marcus checks out the boxes that arrive. Alas, he was disappointed...no little bisquit I didn't hear a bisquit rolling around in the box so I pretended & got one

Marcus checks out the boxes that arrive. Alas, he was disappointed...no little bisquit I didn't hear a bisquit rolling around in the box so I pretended & got one from the cupboard... I also had to break up the huge pill...he's 62.3 lbs but we did it! TY Chewy

Rated 2 out of 5 stars
By Denise on Feb 1, 2026

Nugget size not for large dogs

This nuggets were very hard and small my dogs who are St Bernard’s had to eat 3 according to the weight , it was a struggle to get them to chew I’m going to have

This nuggets were very hard and small my dogs who are St Bernard’s had to eat 3 according to the weight , it was a struggle to get them to chew I’m going to have to find another product that is bigger for dogs over 100 plus lbs

Rated 5 out of 5 stars
By Dora on Jan 18, 2026

Keeping it simple

When my pet (Sam) got new meds, Chewy took care of everything for me. Sam's meds were packed safely and delivered promptly. Thanks Chewy

When my pet (Sam) got new meds, Chewy took care of everything for me. Sam's meds were packed safely and delivered promptly. Thanks Chewy

Rated 5 out of 5 stars
By Wendy on Dec 19, 2025

So happy I don’t have to worry about running out

I thought that I was going to run out of Zeus’s medicine but with my auto ship Chewy takes care of it for me, plus I save a little money at the same time. I absolutely

I thought that I was going to run out of Zeus’s medicine but with my auto ship Chewy takes care of it for me, plus I save a little money at the same time. I absolutely love Chewy!!

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

Quick & Easy Service

One I placed the order, Chewy called the Veterinarian immediately, got the refill, and shipped it out quickly! Top notch service always, thank you!

One I placed the order, Chewy called the Veterinarian immediately, got the refill, and shipped it out quickly! Top notch service always, thank you!

Rated 5 out of 5 stars
By Lisa on Nov 4, 2025

Chewy People Are Awesome!

This was simply an opportunity to say thank you to all the Chewy people who have been so wonderful to me following the death of my boy, Chunk. Whatever the product,

This was simply an opportunity to say thank you to all the Chewy people who have been so wonderful to me following the death of my boy, Chunk. Whatever the product, these people are sensitive and thoughtful and truly care about the pets and their humans. What a rare blessing these days. Thank you, Chewy!!!!

Rated 1 out of 5 stars
By OTIS on Dec 28, 2025

Does not work!

Just bought and gave to 2 dogs who are absolutely covered in fleas! Fleas are quite active. This stuff does nothing. How do I get a refund?

Just bought and gave to 2 dogs who are absolutely covered in fleas! Fleas are quite active. This stuff does nothing. How do I get a refund?

Rated 5 out of 5 stars
By Vivian on Sep 29, 2025

Love that it is a chewable

I used to get my boy the sentinel tablets, but he would not eat them! I had to cut them up and put them in pill pockets, but he would still manage to eat the pill

I used to get my boy the sentinel tablets, but he would not eat them! I had to cut them up and put them in pill pockets, but he would still manage to eat the pill pocket and spit out the pill! SMH! Now, with these chewable s, he thinks I am giving him a treat and eats it right up, taking away my worries about heartworm, fleas, and ticks.

Rated 5 out of 5 stars
By Anne on Feb 1, 2026

great product

I trust Sentinel Spectrum's ability to protect my dog from heartworm

I trust Sentinel Spectrum's ability to protect my dog from heartworm

Rated 5 out of 5 stars
By Elaine on Nov 13, 2025

Effective protection

I’ve been taking Sentinel Spectrum for years, and my mom is glad she can save buying it from Chewy! No heartworms here. -Cora

I’ve been taking Sentinel Spectrum for years, and my mom is glad she can save buying it from Chewy! No heartworms here. -Cora