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Sentinel For dogs 26-50 lbs (Yellow)


Select Pet's Size

  • 2 to 10lbs
  • 11 to 25lbs
  • 26 to 50lbs
  • 51 to 100lbs

Select Pack

  • 6 Chews
  • 12 Chews
Sentinel For dogs 26-50 lbs (Yellow) 6 Chews

Delivery Frequency

Uses: Prevents heartworms. Kills and controlls fleas, roundworms, hookworms, whipworms, and tapeworms

Doses: 1 Tablet = 1 Month

  • Description
  • Key Benefits
  • Directions
  • Safety
  • More Info

Sentinel Heartworm Prevention for Dogs

Sentinel flavored tablets are tasty beef flavored chews for preventing heartworms. They are also used for killing and controlling fleas, roundworms, hookworms, whipworms, and tapeworms. The oral treatment saves the pet from several parasite borne diseases. It can be administered to all breeds of puppies and dogs.

How it works?

Sentinel are flavored tablets for preventing heartworm infection and for treating fleas and gastrointestinal worms. The beef flavored tablets contains Lufenuron, an Insect Development Inhibitor (IDI) that destroys the larval stages of heartworm, fleas and other parasites. It prevents re-infestation by killing the immature life stages of fleas and heartworms.

The powerful treatment remains active for four consecutive weeks. The tasty chews can be administered to puppies and adult dogs and is safe for pregnant female dogs.

Key Benefits
  • Single treatment for a wide range of parasites.
  • Easy to administer oral treatment for treating fleas and intestinal worms.
  • Prevents heartworm infections.
  • Saves the pet from parasite borne diseases.
  • Lufenuron shows zero toxicity to mammals and thus is very safe to use for all breeds of dogs.

You can start Sentinel treatment once the existing heartworm infection test is negative.

Choose the appropriate Sentinel pack out of four different packs categorized as per the weight of the pet. Refer the Dosage table for details.

Give the beef flavored oral treatment once a month along with the meal. The pet will take these tasty chews as a treat.

If not then break it into pieces and mix with the pet’s food. Make sure the pet finishes the meal to ensure ingestion of full dosage.

Repeat every month, preferably on the same date. Give the tablets to breeding dogs and pregnant females at the time of mating, prior to whelping and then repeat at every month.

Consult a vet for further details and guidance.


Dog weight Dog size Pack color
2-10 lbs Very Small Brown
11-25 lbs Small Green
26-50 lbs Medium Yellow
51-100 lbs Large White
  • Do not administer to pets younger than 8 weeks of age.
  • Consult a vet before starting the treatment. Get your pet tested for an existing heartworm infection. If the test is positive and you still administer Sentinel then there are chances of occurrence of a mild, transient reaction.
  • If the test is negative then it is safe to give Sentinel tablets to the pet.
  • Side effects like vomiting, diarrhea, pruritus, lethargy and depression may occur to sensitive pets. In such cases, it is advisable to contact a vet at the earliest.
  • Consult a vet before and after the treatment.


  • Do not use on dogs younger than 8 weeks of age.
More Info
Target species 8 weeks and older puppies and dogs
Mode of administration Oral
Active Ingredient Milbemycin Oxime, Lufenuron
Brand Name Sentinel
Customer Review

Overall Rating


50 reviews

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Reliable Product

Really satisfied with the results

Mar 02, 2024

Karen Hanisch

Fast Delivery

Super fast delivery. Long expiration date. Highly recommend.

Feb 28, 2024


One of the best

Happy with this product, will buy again from here.

Feb 08, 2024



Great product, have used for many years. Never encountered any side effects or unsatisfactory results.

Jan 04, 2024



Great product, have used for many years. Never encountered any side effects or unsatisfactory results.

Jan 04, 2024

Have A Question?

question-arrow Is Sentinel just as good as Simparica

next-arrow Please speak to your veterinarian.

Apr 03, 2023
question-arrow Do the fleas die ?

next-arrow Yes, Sentinel for Dogs is indicated for preventing heartworm disease and killing and controlling fleas, roundworms, hookworms, whipworms, and tapeworms.

Aug 22, 2022