Boo does not look to skinny at all! He actually is built just like my bully Winston. People question me on how skinny he is all the time but I just think he is really healthy. I either walk him or take him to the dog park everyday so he keeps his trim build. If you start to see ribs or something then yes maybe that is a problem but he looks perfect to me! By the way how much does he weigh? Winston is 48LBS and I think that is pefect.