Maple Syrup Urine Disease in Dogs (sweet smelling breath/urine)? r/o/p My min-pin mix's urine and breath smell like maple syrup. I'm taking him into the vet to get checked for diabetes of course, but in the meantime I've been reading about Maple Syrup Urine Disease in humans and wonder if anyone's heard of it in dogs. There seems to be other dogs out there that smell like maple syrup (random ...