Most probiotics for animals consist of many different species and strains, for instance Bifidobacterium animalis I spoke to Dr. Hannah Godfrey, BVetMed, MRCVS, a small animal veterinarian in Cardiff, Wales, who experienced this to mention about offering puppies multivitamins and why you will need to talk to your vet beforehand: https://franciscosuphd.ja-blog.com/33477931/detailed-notes-on-pet-nutrition