Suggested to be used daily to maintain a healthy digestive system. Also useful during times of stress, including traveling, kenneling, training, after antibiotic therapy, deworming and during digestive disorders. Contains a source of live (viable), naturally occurring microorganisms (Bacillus subtilis, B. licheniformis Enterococcus faecium, Lactobacillus acidophilus, L. lactis, L. plantarum, L. fermentum, L. casei). Medium/Large Dogs Label Guarantee: Beneficial Bacteria—not less than 20 million CFU per 4-gram chew