Very skinny, will need a fair bit of rehab, specially cause its happened at such a young age, he may have some developmental problems. Looks to have long sloping pasterns. The front right pastern looks really odd in the second last picture, but may just be the ankle.
Otherwise, he's very cute and would come up looking way better with some wieght on him and a healthy shine. It would balance him out a bit, his head wouldn't look so big and his neck would fill out. He could end up quite a looker with the proper care.
Also he looks to have somebad scarring on his left leg up where it meets his breast... I would ask how that happened and make sure he is completely sound and it won't affect him in the future.