Comfortis for dogs needing flea protection

(redirects here from spinosad)

This page contains details about Comfortis for dogs, you will find information about the correct dosage for dogs, side effects of use and more.

Comfortis, like Vectra-3D for dogs, is a once-a-month antiparasitic treatment. The active ingredient of Comfortis is spinosad which functions by attacking the nervous system of insects leading to the rapid death of adult fleas. This substance is naturally occuring and is derived from soil microbes. Comfortis is easier to administer than most other antiparasitics as it is given orally in the form of chewable tablets as opposed to being a topical solution. This also helps avoid the complications associated with the possibility of topical treatments being washed or rubbed off by accident.

Comfortis begins affecting fleas within 30 minutes and kills 98-100% of the fleas within 4 hours.

Comfortis dosage for dogs

Comfortis products come in different packages and formulations suitable for different sizes of dog, for example, the green box is traditionally meant for dogs weighing 20.1 to 40 lbs. Comfortis products are available for all dogs weighing between 3.3 lbs to 120 lbs, make sure you choose the product which matches the weight of your dog. You should administer one chewable tablet once a month.

If your dog weighs over 120 lbs you will need to use an appropriate combination of tablets which your vet will help you with. Avoid use completely in dogs weighing under 3.3 lbs or in dogs who are under 14 weeks old.

Is Comfortis safe for dogs?

Comfortis for dogs is quite safe when used under veterinary guidance and approval on a monthly basis so long as you follow the safety precautions outlined below. Keep in mind that you should only give Comfortis to dogs over 14 weeks old and over 3.3 lbs. This medicine was the first chewable monthly flea preventative to gain approval from the FDA. It also has the added benefit over topical solutions of negating the possibility of your dog affecting other pets in the home through contact which means your dog will be free to play with his other animal and human friends straight after taking the medicine.

Despite its safety it’s still recommended that you talk to your vet before administering the drug especially if your dog is prone to seizures. Pets with an allergy to pork-based products may suffer negative reactions when given this substance. If you have reason to believe your dog suffers from a porcine allergy it’s important that you speak to a professional for further advice.

Safety precautions

  • Notify the vet if your dog has a history of seizures
  • Consider avoiding use in breeding, pregnant or lactating dogs
  • Avoid administering alongside unusual doses of ivermectin for dogs unless advised otherwise by your vet
  • Tell the vet if your pet suffers from a pork allergy
  • Seek veterinary approval before using Comfortis for dogs
  • Do not administer this drug to dogs under 14 weeks of age

This medicine should not be administered without veterinary approval and guidance and may cause seizures in susceptible dogs. If Comfortis is not right for your pet there are many other flea-fighting treatments on the market which you may wish to consider, including Sentinel for dogs, which is also given orally on a monthly basis. Sentinel also safeguards your pet against several other forms of parasite including heartworm and roundworm.

Uses of Comfortis for dogs

Comfortis is given to dogs for preventing/treating:

  • Fleas

Comfortis is not effective for treating/preventing other types of parasite. If you wish to protect your pet against other forms of parasite, you may opt to try Sentinel for dogs, which is another once-a-month parasite preventative medication.

Side effects of Comfortis when given to your dog

One of the most common side effects you can expect when using Comfortis is vomiting. The official site states that you should re-administer a full dose if your dog vomits within an hour of ingesting the treatment. However, if your dog vomits again after re-administering the drug we advise you to call your vet just to be on the safe side.

Other possible side effects include depression, fatigue, itching, diarrhea, decreased appetite, incoordination, tremors, excess salivation and seizures in susceptible dogs. In cases of severe adverse side effects developing after administering Comfortis you should seek emergency veterinary care. Most serious side effects are a result of administering Comfortis alongside ivermectin (Heartgard), always avoid this combination unless told otherwise by your vet. Effects of this drug on pregnant/lactating dogs has not yet been evaluated.

If after a month your pet still has fleas, visit the vet for advice on how to proceed. The official website suggests that dogs suffering from fleas after a month of treatment with Comfortis for dogs are infected with new fleas, which could be due to other household pets being infected, or as a result of the living environment.

Vectra 3D flea treatment for dogs
General information about Comfortis

comfortis for dogs