personally doesn't look like enough meat to me but how much chicken are you feeding him and how many times a day. Also chicken backs are ok to start with but hes going to need a lot more muscle meat (MM) and just so ya know hearts are considered muscle meat not organ meat. Don't start him on any organ meat off the jump its really rich. If you do alot of chicken backs they are getting too much bone and not enough meat and it will generally cause constipation.