They have to be caught very very young to be tamed. A wild coon once it looses the fear of humans can be quite a problem. They will if hungry challange you. Also in the spring where's there's one look for more of them. Coons generally stay together till at least half grown with mamma. It's best not to leave such things as dog food out overnight though they as likely will show up at noon just as they will at night. I shot three one morning two years ago in my front yard. They stood there and looked at me till I shot. Even shocking them with an electric fence for cattle didn't deter them. Only a bullet would suffice. Best to use a shotgun as they likely will be running.
I also helped some friends capture a live half grown coon about 25 years ago. It is an animal you don't want to mess with. If anybodies ever seen a dog tore up by one you'll understand the damage they can do. The coon that bit the kid may or may not have been rabid.
It sure sounds rabid to me.