A side effect of trifexis is vomiting which according to the discussion I had with my vet results from the comfortis. I elected not to use this product. Your dog already had an inital reaction to comfortis and I really don't understand why your vet would prescribe another product with the same ingrediant.
__________________ Deb, Reese, Reggie, Frazier, Libby, Sidney, & Bodie |