Our Malamutes & Schnauzer has had this quite a lot during their first 6 yrs of life. Mals are now 7 & 8 and our Vet has me out them on cooked rice made with chicken broth. They get sev sm feedings ea day. On the 2nd day I can add a tblsp or 2 of cottage cheese to it. On the 3rd day I can add some boiled skinless chicken that I shred up. Usually by the end of 7 days, they are fine. I then start decreasing the rice mixture & adding in some sm amts of their dogfood until they are back on straight dogfood. I also can put in a TBLSP of honey in their drinking water to get them to drink a lot so they do not dehydrate. Or give them children's Pedialyte to drink, which they will not drink at all. LOL I feel for you & your pupper.