A Dog Who Is Always Hungry

We adopted our rescue dog about a year ago. She had been a stray, and at the time we adopted her the vet thought she was about ten months old. Ever since we’ve had her she has had the same symptoms – she doesn’t seem to be able to properly digest her food. She is ravenously hungry all the time. She will eat unlimited amounts of anything – fruits, vegetables, yogurt, bread, anything she can get her paws on. And her stools are not normal; she has about four bowel movements per day, and they get progressively softer throughout the day.