Sorry, I didnt see that youd left me a message months ago about the appy Aj. I dont recall seeing a scar on his chest unless it healed up quite nicely. I dont know much about Aj's past but I think he was originally trained to be an endurance horse. Could be wrong. He was HUGE for an appy, around 16.2 or so with a very WB type of build. He was sold quite some time ago as a trail horse but I dont know what hes doing now or anything. Sorry im not of much help!