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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

Our Price

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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.

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    K9 Advantix II for Dogs
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Rated 4.5 out of 5 by 183 reviewers.
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
Rated 5 out of 5by AwesomeNothing bad to say about this product. Ive been using it since my boys were puppies. 05/10/2018
Rated 5 out of 5by SentinelI have been using Sentinel for two years , Its effective and Max doesn't mind it. I break it in half and he chews the tablet. I used to have a terrible time with Trifexis for my previous pup, a German Shepherd . Horrible taste and smell. 05/08/2018
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