Trifexis contains some hydrolyzed soy and is flavored with artificial beef from a pork - based protein.1 The amount of hydrolyzed soy in Trifexis is comparable to the amount of the hydrolyzed soy in
hypoallergenic diets.1 If your
dog is allergic to soy or pork, you may consider talking to your veterinarian about whether other heartworm, intestinal parasite or flea protection products may be more
appropriate for your
dog.