Hi! Charlie definitely looks like a Jack from the pic you have posted. Is he at least 50% white in color? I do see that he has a nice amount of Sable brown too? Jack breeds have to have 50% white on them. He is adorable. Lots of wonderful years with him. I have two Jacks, Chasie and Chloe, and to us, they are the best breed in the world...Good Luck!