Dogs are characterised by a wide variety of breeds, both in terms of physique and character or disposition. They require a well-balanced diet rich in nutrients. The probiotics can be used periodically in all breeds and age groups of dogs as an additive to feed or drinking water. Their beneficial effect lies in lowering the pH of the intestinal contents through the production of acidic metabolites, which include the dextrorotatory lactic acid, acetic acid, propionic acid and formic acid. The low pH of the large intestine hinders the growth of enterobacteria, spore-forming anaerobic bacteria and other pathogenic microorganisms.