Abstract:Antibacterial drugs have played important roles in treating bacterial diarrhea in pet animals; however, with the increase of bacterial resistance, the therapeutic effect of antibacterial drugs has been severely reduced. Probiotics are defined as “live microorganisms conferring health benefit on the host”, and have the potential for preventing, treating and healing bacterial diarrhea in pet animals. The application of probiotics in treating bacterial diarrhea is grossly promising. The species of bacterial pathogens, characteristics and prevention and treatment of current situation of diarrhea in pet animals, as well as the species, screening requirements, mechanisms, existing problems and application prospect of probiotics ameliorating gastrointestinal diseases in pet animals are reviewed.