I'm kind of with Wylie's Mom. I don't crate, but not sure you want the crate to be a punishment- he may not relate why he has been put in the crate - instant correction is the best along with consistency.
I could not say it if has anything to do with not bein neutered or not - don't have that kind of knowledge. Do know that obedience classes are always good if done positively! Good luck!
__________________ .  Cali  , and Cali's keeper and staff, Jay No, not a "mini" Yorkie - She loves to motor in her Mini Cooper car |