I recently purchased my pacman from a friend who was unable to keep him. I have been taking as good care of him as possible. He has shiny, alert eyes, quick reflexes, and normal behavior. All in all, he doesn't seem to be in terrible shape. He came out to sit in his water dish for the first time today (the first time I saw him do it anyway) and I noticed that I can see the contours of what appear to be hip/leg bones. I'm pretty sure this isn't right, and that he is underweight. Does this indicate he is underweight? What is the best way to raise him to a healthy weight quickly if so? Thanks for your help.