Sentinel for Dogs
Sentinel for Dogs
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At a Glance
Combination of two active ingredients protects dog parasite infestations.
Lufenuron controls flea larvae reproduction.
Milbemycin is heartworm disease preventative & controls intestinal worms.
One chewable tablet per month is administered orally to work for the next 30 days.

Sentinel for Dogs

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At a Glance
Combination of two active ingredients protects dog parasite infestations.
Lufenuron controls flea larvae reproduction.
Milbemycin is heartworm disease preventative & controls intestinal worms.
One chewable tablet per month is administered orally to work for the next 30 days.

Sentinel Logo

Ultimate Guide to Sentinel for Dogs

Meet the Powerful Parasite Preventer: Sentinel for Dogs!

Sentinel for Dogs is the veterinarian-approved dog medication that protects your dogs from various dangerous tiny parasites, internal and external. Sentinel is a monthly, chewable oral tablet that also prevents vicious heartworm disease that is transmitted from mosquito bites. Sentinel ensures that your pup is in their healthiest condition.

How does Sentinel for Dogs work?

Sentinel for Dogs is a medication with two active ingredients (Lufenuron and Milbemycin Oxime).

Lufenuron is an insecticide that distributes into the dog's body fat which the adult flea will eat and pass on to its eggs. As a pesticide and insect growth regulator (IGR), it inhibits the development of chitin which builds a larval flea's exoskeleton. When they hatch, the flea larva dies when its inner organs are exposed to air.

The second active ingredient, milbemycin oxime, is a powerful parasiticide and an anthelmintic, or dewormer. It is 100% effective heartworm disease preventative. It also controls three dangerous intestinal worms (i.e., adult roundworms, hookworms, and whipworms).

Because Sentinel for Dogs is a heartworm disease preventative, make sure every dog is tested by your veterinarian before prevention therapy or using Sentinel.

How is Sentinel for Dogs administered?

Sentinel for Dogs is administered orally once a month and protects your dog for the next 30 days. These beef-flavored chewable tablets can be used as dog treats or, most effectively, eaten with the dog's food. Sentinel is used year-round for maximum prevention effectiveness.

Body Weight Milbemycin Oxime/Lufenuron per Tablet (mg) No. of Tablets
2 - 10 lbs.2.3/46One
11 - 25 lbs.5.75/115One
26 - 50 lbs11.5/230One
51 - 100 lbs.23/260One
What dogs should not be given Sentinel?

Dogs that are below 6 weeks old or weigh less than 2 pounds. Breeding, pregnant, and lactating females have not been evaluated.

What are the potential side effects of which you should be aware?

Test for heartworm disease before deworming therapy or before using Sentinel. Sentinel's most common unfriendly reactions reported are vomiting, diarrhea, itching, decreased appetite, hives, and seizures. Contact your veterinarian if any effects occur.

Frequently Asked Questions
  1. What is Sentinel for Dogs?

    Sentinel for Dogs is the veterinarian-approved dog medication that protects your dogs from various dangerous tiny parasites, internal and external. Sentinel is a monthly, chewable oral tablet that also prevents vicious heartworm disease that is transmitted from mosquito bites. Sentinel ensures that your pup is in their healthiest condition.

  2. What is in the Sentinel tablets?

    Milbemycin Oxime and Lufenuron are both protectors of your dog against internal and external parasites.

  3. What does Sentinel kill and not kill?

    Sentinel for Dogs is only effective against flea larvae D. immitis, not adult fleas or ticks. However, as an insect growth regulator, Sentinel doesn't allow flea eggs to develop into adult fleas. Sentinel does not kill ticks. Sentinel controls roundworms, heartworms, hookworms, and whipworms, but not tapeworms. See #4.

  4. What is the difference between Sentinel and Sentinel Spectrum?

    Both medications have the two active ingredients, milbemycin oxime and lufenuron. Milbemycin oxime is a 100% effective heartworm disease preventative and acts as a monthly layer of protection against gastrointestinal worms. The latter acts as a flea birth control that inhibits the normal development of flea larva. Sentinel Spectrum also contains the anthelmintic praziquantel (a generic name for the brand Sentinel) which also treats tapeworms.

  5. Is there Sentinel for Cats?

    Sentinel for Dogs was only made to be administered to dogs, and therefore it is not for cats.

  6. Is Sentinel for puppies?

    Sentinel can be administered to puppies that are at least 6 weeks old and weigh 2 pounds.

  7. What does the Sentinel for Dogs reviews say?

    Sentinel reviews rate 4.5+ out of 5 stars. Most reviewers say that Sentinel trust it as the only flea and heartworm prevention treatment that they allow for their furry best friend.

  8. How long does it take for Sentinel for Dogs to work?

    Sentinel begins to work Immediately as a wonderful combination of the heartworm prevention formula that distributes through the dog's system and into the dog's body fat.

Concluding Thoughts

The most important thing that you should know about Sentinel is its power to protect your dog from tiny parasites and the dangerous heartworm disease, internal and external parasites.

DISCLAIMER: Ask your veterinarian or consult with one of our pet care specialists at 1-800-844-1427. This informative article is not meant to substitute for the diagnosis, treatment, and professional advice from your veterinarian or other qualified professionals regarding a medical condition.

Sentinel for dogs contains Milbemycin oxime and Lufenuron.

Medication Guide: Using Sentinel for Dogs - Sentinel Flavor Tabs

Ask your veterinarian or consult with one of our pet care specialists at 1-800-844-1427.

This information is for informational purposes only and is not meant as a substitute for the professional advice of, or diagnosis or treatment by, your veterinarian. Always seek the advice of your veterinarian or other qualified professional with any questions you may have regarding a medical condition. Never disregard or delay seeking professional advice due to what you may have read on our website. Our medications are FDA approved and/or EPA regulated when and as required by law.

IMPORTANT SAFETY INFORMATION: Dogs should be tested for heartworm prior to use. In a small percentage of treated dogs, digestive, neurologic, and skin side effects may occur. For complete product information refer to the product insert.

Administer Sentinel for dogs orally or crumble into food. A second treatment may be necessary.

*Cats 4 pounds and under: 1/2 tablet as a single dose

*5-11 Lbs: 1 tablet as a single dose

*11 pounds and over: 1 1/2 tablets as a single dose

Store Sentinel for dogs in a cool, dry place.

Sentinel for Dogs is manufactured by Merck Animal Health
Option UPC/SKU
BROWN,2-10 lbs. 6 Month Supply 716688522115
GREEN,11-25 lbs. 6 Month Supply 716688522214
YELLOW,26-50 lbs. 6 Month Supply 716688522313
WHITE,51-100 lbs. 6 Month Supply 716688522412
BROWN, 2-10lbs. 12 Month Supply 716688621115
GREEN, 11-25lbs. 12 Month Supply 716688621214
YELLOW, 26-50lbs. 12 Month Supply 716688621313
WHITE, 51-100lbs. 12 Month Supply 716688621412

How to Order Prescriptions Online

1. Find the Right Product

Make sure it matches your pets prescription. Donโ€™t forget to compare the dosage for pills/capsules!

2. Add to Cart

Just like any other online store. Make sure the quantity matches whatโ€™s been prescribed by your vetinarian.

3. Tell Us About Your Pet and Vet

Answer some questions during checkout and weโ€™ll contact your vet and verify the prescription for you. You can also mail us the written prescription.

4. Thatโ€™s It!

If the prescription has any refills, processing your future orders for that medication can be expedited.

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