My papillon neutered male is 16 months old. At his 6 month checkup, before he was neutered, he weighed 4 lbs, 4 oz. I thought he was too thin, as his ribs really stick out. My vet said he was ‘perfect’ and not to worry about it. Recently, he completed 8 weeks of agility classes and the instructor was very concerned that he is too thin. I just had him to the vet and he now weighs 4 lbs, 1oz, and he is 16 months old! When I said something to the vet he said not to worry about it. I know that paps tend to be thin, and he seems happy and healthy, but I do worry that he has lost weight from the time he was 6 months to the time he was 16 months. That just doesn’t seem right. Shoud I be concerned? And if so, how should I get him to gain weight? The vet said to leave out food all the time, because he is so small, but the agility instructor strongly disagreed and said to feed him twice a day. I have found a dry food with a very small pellet (Diamond Small Breed) that he seems to like a little better than his old food (Iams), but he still just doesn’t seem that interested in eating. He eats between 1/4 and 1/2 cup of food a day, depending on his appetite. So far I have avoided canned food because I have heard that dry food is better for their teeth. Any advice?