actually that's not always true about seeing bones. I have a shorthair you could see all her bones until she was 2. I was concerned about it. Fed her as much as she would eat and even was feeding her high calorie diets. Took her to the vet every three months. Vet said she is healthy and will put on weight when she slows down. That took two years. I was worried someone was going to call on me for neglect so I kept taking her to the vet. I could see every spine bone and her ribs. They dog literally would not stop moving from the time the lights went on in the morning till they went off at night. She was crated during the day to help her conserve energy. Sometimes dogs are just very thin no matter what you do. I tried everything, but the dog would only eat so much. You can't force feed a dog. This dog is not driven by food. I could put her favorite human dish on the floor next to a pheasant wing and she would choose to point the pheasant wing instead of eating. She eats maybe a cup twice a day, although she rarely finishes her food.