A growing number of veterinarians are prescribing supplements of friendly bacteria for dogs, but is there enough scientific evidence to justify it?
All dog owners who have had to clean up after their beloved pooches know that people aren't the only ones who experience gastrointestinal disorders. Many animals, including man's best friend, also suffer from both short-lived and chronic digestive woes. As a result, some veterinarians have begun prescribing supplements containing friendly bacteria, or "probiotics," to ease related symptoms such as diarrhea, vomiting, gas and bloating. But some animal experts say there is little solid evidence that the supplements are effective.

Gastrointestinal (GI) issues are the second-most common health problem in dogs after skin diseases, according to Richard Hill, a small-animal internist and clinical nutritionist at the University of Florida College of Veterinary Medicine in Gainesville. He notes that common causes include parasites such as hookworm, whipworm and giardia as well as "dietary indiscretion," which could mean anything from gorging on table scraps to drinking from the toilet to raiding the garbage.