Hi Lindsey-
Has your pup gotten any better in the last couple of days?
The new food is most likely much higher in fat than the food you were feeding that was working well. A slower transition to a food that is closer to the same fat percentage of the prescription food you were feeding would be better. Have you contacted the vet with the issue? Puppies tend to get diarrhea pretty easy. You need to be very careful that they do not get dehydrated and lose even more weight by switching foods.
Good luck and report back!
