MedicationsWhy is my dog still scratching after Trifexis for fleas?
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.
Updated on September 24th, 2025