Wholistic Acidophilus is extremely concentrated so your pet gets a powerful dosage of probiotics! Our acidophilus replenishes the "friendly" bacteria" normally found in the digestive tract. Without a proper balance between "good" and "bad" intestinal bacteria, digestive upsets can occur. This supplement is especially useful after antibiotic therapy, during times of both emotional and physical stress, sickness and disease. Recommended Daily Dosage: Small Dogs & Cats: 1/8 tsp Medium Dogs: 1/4 tsp Large Dogs: 1/2 tsp 5 Billion CFU/Gm Just sprinkle on food.