In addition to what has been posted, yes you can give your dog acidophilus. I use a product that I buy it from herbal remedies online and I mix it with 1-2 tsp of plain greek yogurt and let them lick it whenever they are on medicine or whenever I want to supplement their diets. I store it in the fridge. Oh I buy it at
Acidophilus for Dogs & Puppies, Dog Probiotic, Kosher & Lactose Free - 16 fl. oz. - Dynamic Health