With well trained, what do you mean? Is he generally respectful of you? Crate trained, does he have impulse control? He is not a 2 year old baby, he is a young adult male dog. I hope you don't treat him like a baby. He might have strat climbng the social ladder and see how far he could go.
On another note the beef rib from your party, was it cooked? Because that can be dangerous as it might splinter and harm him. Bones should never given cooked.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015