Hi my name is liz and I have a pure bred brindle boxer. As a puppy he was always rolly polly and within the past month he has gotten much bigger and all of sudden looks so thin its really scary for me. He has 3 ribs that you can see from side and when looking over 2 ribs show. His hip bones show really badly and sometimes his hind legs get shaking really badly when he is eating and drinking. I switched his food to nutro main ingredients are meats and we bought him a food water dish that is up high for him to stand instead of reaching down to eat or drink. We also bought balls to put into his food dish so he wouldn't devour it in 2 seconds as he was doing. Some people who know the boxer breed say he looks OK and other people think I am starving him! Please someone help me what should I do?