The Proviable DC and Fortiflora are both medications to help the dog or cat's intestinal health and help treat diarrhea. However, the similarities end here for both. Fortiflora contains a single strain of probiotics to help with the intestinal health of the pet. Apart from that, it comes with live cultures and vitamins. On the other hand, Proviable has several beneficial bacterias, including both probiotics and prebiotics. Moreover, every single capsule of the Proviable has five billion colony forming units. Therefore, while Fortiflora is still a good option, Proviable is better.