Rhino 5 Ratchet My Golden Retriever Has Diarrhia Because I Swithced Him From Blue Rhino To Science Diet?

My golden retriever has diarrhia because i swithced him from blue rhino to science diet? - rhino 5 ratchet

Does anyone know about these foods? How can I help with diarrhia? Blue Rhino too expensive to try in their diet, change the science. my gold is 1.5 years