Sentinel Spectrum Chew for Dogs, 8.1-25 lbs, (Green Box), 6 Chews (6-mos. supply)

Have a Chewy account?
Sign in to quickly add pet health details.
$53.99 Autoship Price
  • Never miss a dose with easy refills
  • Skip, change, or cancel anytime
$53.99 Chewy Price
($9.00 /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
4.8
Rated 4.8 out of 5 stars
1415 Ratings

Customers Mention

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

Ease of Use

94% Positive

Effectiveness

94% Positive

Ingredients

92% Positive

Long-Term Benefits

94% Positive

453 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 Nancy on Nov 22, 2025

Glad it’s still available

This is a very effective medication. We never have a problem with fleas and I don’t have to worry about heartworm as long as I’m using product. In the summer, I

This is a very effective medication. We never have a problem with fleas and I don’t have to worry about heartworm as long as I’m using product. In the summer, I use a flea and tick spray if there’s a problem with ticks, but there’s generally not a problem where I . Very happy with this product. I’ve used it for 10 years.


Rated 3 out of 5 stars
By Glenn on Jan 19, 2026

Sentinel chews

Good product however I have to chip it up in small pieces to get my toy poodle to eat it. She can even pick the flakes out of her food.

Good product however I have to chip it up in small pieces to get my toy poodle to eat it. She can even pick the flakes out of her food.


Rated 5 out of 5 stars
By Edward on Jan 5, 2026

Ease of ordering, fast delivery

We have used this product a long time. No side effects or issues. Recommended by our breeder. Our pups think they are getting a treat.

We have used this product a long time. No side effects or issues. Recommended by our breeder. Our pups think they are getting a treat.


Rated 5 out of 5 stars
By Robert on Dec 29, 2025

Does not make my dog sick

The flea and dewormer meds from our vet made our 25# dog sick. He recommended this is as an alternative, and it costs less as a bonus.

The flea and dewormer meds from our vet made our 25# dog sick. He recommended this is as an alternative, and it costs less as a bonus.


Rated 5 out of 5 stars
By Arianjel on Jan 17, 2026

Best Price and Convenience

Our vet was charging over double for our medicine. I like that I do not have to think about it at all.

Our vet was charging over double for our medicine. I like that I do not have to think about it at all.


Rated 5 out of 5 stars
By Elena on Dec 15, 2025

Her efficiency

In a very short period of time she was able to tell me the information I needed and answer every single question I had.

In a very short period of time she was able to tell me the information I needed and answer every single question I had.


Rated 5 out of 5 stars
By Michelle on Oct 18, 2025

Best value

Sentinel Spectrum is by far the best value for heartworm, flea, and worm protection. It doesn’t protect from fleas but it’s also not 3x the price for other bran

Sentinel Spectrum is by far the best value for heartworm, flea, and worm protection. It doesn’t protect from fleas but it’s also not 3x the price for other brands.


Rated 5 out of 5 stars
By Randy on Sep 12, 2025

It works!

Been using this for years. Heart Worm plus flea protection. No flea drops needed. Yes, occasionally she gets a flea on her foot until she bites it, but have never

Been using this for years. Heart Worm plus flea protection. No flea drops needed. Yes, occasionally she gets a flea on her foot until she bites it, but have never seen a flea on her body. Once a month pill.


Rated 5 out of 5 stars
By Rick on Oct 7, 2025

Came when promised with no damage.

The ordering process was very smooth. The part where you guys send the request to our veterinarian and get them to confirm the prescription is extremely helpful

The ordering process was very smooth. The part where you guys send the request to our veterinarian and get them to confirm the prescription is extremely helpful.


Rated 5 out of 5 stars
By Martha on Dec 21, 2025

Communication

I appreciate being notified about what is happening with the Chewy order.

I appreciate being notified about what is happening with the Chewy order.