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At a Glance
Prevents heartworm & kills flea eggs in dogs
Delicious beef flavor
Kills flea eggs and prevents infestation
No messy pipette application
This product requires a prescription.

Sentinel for Dogs

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Pet Size
Don't know your pet's weight?
If you can't get them on the scale, try this super simple method:

1) Weigh yourself.
2) Weigh yourself holding your pet.
3)Subtract the two numbers to get their weight.

Too heavy to hold? Your vet will weigh them if you ask (or may already have it on file if you call).
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How To Order Prescriptions Online

  • 1

    Find the right product

    Make sure it matches your pets prescription. Don't forget to compare the dosage for pills/capsules!

  • 2

    Add to Cart

    Just like any other online store. Make sure the quantity matches what's been prescribed by your veterinarian.

  • 3

    Tell us about your pet and vet

    Answer some questions during checkout and we'll contact your vet and verify the prescription for you. (you can also mail us the written prescription)

  • 4

    That's It!

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

  • Other Customers Also Bought for their Pet

    Frontline Plus
    • Kills any disease carrying tick within one day of application
    • Prevents every stage of flea life (eggs, larvae, and pupae) from developing into adults
    • Frontline Plus is waterproof
    • Available in 6 or 12 month packs, for dogs in weight ranges 5-22 lbs, 23-44 lbs, 45-88 lbs, and 89-132 lbs
    K9 Advantix II for Dogs
    • Kills fleas and ticks within 12 hours
    • Kills flea eggs, pupae, larvae, and adults for 30 days
    • Kills and protects against mosquitoes, which are the primary cause of heartworm
    • Protect your dog from a variety of disease carrying ticks
    Seresto 8mo. Dog Flea & Tick Collar
    • 8 month protection
    • Kills and repels fleas and ticks
    • For use on dogs and puppies 7 weeks and older
    • Easy, fast-acting, long-lasting, and odorless

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Rated 4.5 out of 5 by 185 reviewers.
Rated 5 out of 5by Good for my pup!She thinks that she is a treat while taking this medicine. She says she wants more of this. 01/09/2019
Rated 5 out of 5by Great PricesOne pill does all great to use and dogs love it. 12/29/2018
Rated 5 out of 5by flea meds workuse them. otherwise you will have a house of fleas... 11/06/2018
Rated 3 out of 5by My dog never had fleas, until I switched to SentinelI had been using Trifexis on all of my dogs. For the past few months, I've been using Sentinel instead, since Trifexis is just not in my budget. While I can't tell a difference on my two black dogs, my white dog has been having visible fleas all the time. Since Sentinel only kills flea's eggs and not adult fleas, we started having a flea issue in the house for the first time, since we've had these dogs. We live a warm state with long, warm summers and fall, so I'm thinking Sentinel isn't going to cut it for us. 10/09/2018
Rated 5 out of 5by Does the jobMy pupper finds this pill easiest to eat, and does not throw it up later like others we have tried. 08/27/2018
Rated 5 out of 5by Sentinel works great!!I take my dog to the dog beach and dog parks so he is exposed to many parasites but he remains parasite free. Sentinel works great! 08/11/2018
Rated 5 out of 5by great productmy dog takes this without difficulty. easy to give and very effective! 08/08/2018
Rated 5 out of 5by SentinalYou have to presume it will work. 07/17/2018
Rated 2 out of 5by Sentinel..Is A Big No NoI've been using Comfortis and Trifexis for years and never had an issue. I decided to save a few dollars by switching to Sentinel, since it was compared to Trifexis...worst mistake ever. Seems like the fleas are attracted to my dog even more. I will never buy this stuff again. Will be switching back to what I know works. Comfortis or Trifexis. 07/03/2018
Rated 5 out of 5by Sentinel Works for FleasI have been using Sentinel for years for my pugs and have not had any problems with fleas. Two years ago I switched to Seresto flea collar that was suppose to work for 8 months and within 5 months all my dogs had fleas. I have switched back to Sentinel and also use Frontline Plus during the summer months. 06/08/2018
Rated 5 out of 5by So Easy and ConvenientPurchased my heartworm meds for my 5 Chihuahuas from PetCare RX. The service is perfect for me. Easy order, they contact my vet for approval, great communications regarding status of my orders. Love that I can pay with Paypal! Will continue to use this petmed pharmacy! Thank you PetCareRX!! 05/26/2018
Rated 5 out of 5by does its jobso far works well for my dog, no fleas or ticks despite walking and running in wooded areas. 05/14/2018
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