My dog still has fleas after Comfortis. Why is she still scratching?

Trifexis works by killing fleas when they bite your dog, but they don't repel fleas. If Dallas is still scratching a lot, fleas could be getting on him from the home, or he could have developed a flea allergy from a previously heavy burden of fleas. It is important to disinfect your home when your pet has had fleas. Wash his bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. I would also take Dallas into the vet to discuss the continued scratching, as he may benefit from medications such as steroids if he has a flea allergy.

I'm sorry you're having such a challenging time with Meowsie. It certainly is good of you to treat a feral cat. Crushing Comfortis and mixing it with food shouldn't cause a problem with its absorption, so I doubt that is your problem. If you are still seeing fleas, you might ask your vet for another recommendation, but Comfortis tends to work well. Unfortunately, when a cat has flea allergies or chronic skin problems, it can take a while for the itching to improve even once the fleas have been treated. I might consider giving her a fish oil supplement daily to help improve her skin and decrease her itching. There are a number of fish oil supplements for cats such as Wellactin ( http://www.welactin.com/?pg=cat ). Good luck! I hope that was helpful. Thanks for using PetCoach.

Hmm - it's odd that the Trifexis doesn't seem to be working as well, because it actually has the same active ingredient as Comfortis. The only difference is that it has an added ingredient for heartworm prevention, otherwise it's exactly the same drug. In my experience, both are extremely effective for fleas. I wonder if perhaps Tessa is continuing to pick up fleas from somewhere in the environment? It does take a few hours for a flea to die after biting her, so if she is continually being re-infested from the house or yard, it's very possible that you might see live fleas on her even if the medication is working properly. If you think this might be the case, I would recommend treating your house and yard with a premises spray such as Knock-Out. If you still want to get her something else for fleas, I would not recommend giving a Comfortis dose on top of the Trifexis, because this would just be giving a double dose of the same drug - I would be concerned about possible side effects from overdosing this medication. Instead, you could consider using a topical flea medication this month such as K9 Advantix, since this is a completely different medication that doesn't interact in any way with the Trifexis.

You have to treat the environment as well, as fleas don't live on the dog, they live in the home. If you haven't treated your home, that could be why Kobi is still scratching. Wash his bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home. I hope this helps.

Yes, as long as he doesn't vomit within 1 hour it should be effective. Always remember to give it with a meal. If he continues to vomit after the 3rd dose of Comfortis, switch your product. Thank you for using Pet Coach.

Hi, The truth about expiration dates is that they are usually not based on any studies and the drug is likely to be just as effective years after. I can't say for sure, but it's likely that Comfortis will work. However, the fleas should all be dead within 24 hours, so if you are still seeing live ones jumping around, then it likely didn't work well. You can definitely use the flea collar with Comfortis and this may help to rid her of the remaining fleas. I recommend waiting another week after applying the collar to assess if the treatment worked. If you are still seeing fleas crawling around, then you can try a different flea product like Frontline. Avoid any products that contain ivermectin or any other avermectins for at-least 4 weeks after giving the Comfortis - you can check for this by looking at the active ingredients on the package...any name that ends in "-mectin" should be avoided. I hope that helps and Maggie if flea-free soon.

IF they vomited within an hour of the medication, then the medicine did not digest to work for them. This is the most common side effect of Comfortis and seems to be so often, I have quit recommending it. I have had great success with flea control and no vomiting side effects by using Nexgard for monthly or Bravecto given every 3 months. I would recommend changing products and if redosing them immediately if they vomited under an hour of getting the Comfortis.