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comfortis for dogs

Comfortis Chewable Tablets (Spinosad)


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).


  • Description

    Comfortis is known to be the fastest-acting flea killer tablet available to pet owners, and it starts to kill fleas on dogs and cats within 30 minutes of being ingested. Both Comfortis for dogs and Comfortis for cats kill fleas before they are able to lay eggs. It then continues to kill them for a full month afterwards. Controlled lab studies showed Comfortis chewable tablets killing 100% of fleas on dogs and 98% of fleas on cats within 4 hours of being eaten. A large part of the appeal of Comfortis flea tablets for pet owners is that they’re flavored to make dogs and cats perfectly eager to eat them.

    Buy Comfortis online from World Pet Express to get the best price on this flea medication for dogs and cats.


    Comfortis for cats comes in 3 different dosages based on body weight, and Comfortis for dogs comes in 2 different dosages based on body weight. Choose the one that applies to your pet, and then administering Comfortis chewable tablets is easy. Most pets will happily eat them right out of your hand, but for ones that won’t it’s simple to mix them into wet dog or cat food and have them ingest it this way.

    Comfortis should be administered only once a month. You should not give your pet an additional chewable if you believe they are not getting the response you expect from the medication. Try to give your pet their Comfortis chewable at the same time every month.

    Comfortis is approved for cats 14 weeks of age and up and weighing at least 4.1lbs. Comfortis is approved for dogs 14 weeks of age and up and weighing at least 5lbs.


    The active ingredient in Comfortis chewable tablets is Spinosad.


    Use with caution for dogs and cats with pre-existing epilepsy. Not for human use and keep this flea medication out of the reach of children


    Serious adverse reactions have been reported following concomitant extra label use of ivermectin with Comfortis. The safe use of Comfortis for dogs or Comfortis for cats has not been determined for animals that are pregnant, nursing, or lactating and owners with these pets should speak to their veterinarian before using Comfortis.

    Side Effects

    Use of Comfortis for dogs or Comfortis for cats may lead to the following side effects:

    • Vomiting
    • Decreased appetite
    • Lethargy
    • Diarrhea


    As well as more uncommon ones like coughing, polydipsia, hyperactivity, and excessive salivation. Excess amounts of any side effect should lead you to discontinue the medication and consult with your veterinarian.

    Product Code : 12454