J.A.
At his age, I would suggest a "naughty" chair. Or, a naughty rug, whatever. You shouldn't really make him stay there for too long, because then it just gets frustrating. A naughty chair worked for me, at that age, and some of my friends use a "naughty" mat, so it can go where they go. I would have to say, 2 minutes tops, so he understand that his behavior is wrong, but, it won't be so long, that he forgets why he was put there. The chair, or mat, or whatever is never toi be played with, or used for any other purpose then bad behavior. That way it is only a association with bad behavior.I hope perhaps, this is an idea that could help you, and help him to understand bad behavior. It is suppose to frustrate him somewhat. It is discipline, no one likes discipline. You don't reward bad behavior. This way, if he starts hitting the dog, or whoever, he goes back on the chair! If he gets off, you just put him back. It is hard, but, in the end it is what you strive for. A well behaved, respectful child. It takes time, but, what doesn't. You have to start with discipline now, because as he gets older, so will the problems get bigger. Nip it in the bud!!! Good Luck.