Tantrums!

You are right, that's dominant. For the grabbing, shaking, pushing stuffie into the wall......get up, go over to him, stand up straight and tell him No and stand there until his ears relax and he becomes submissive. No more words, go back and sit down. You have to be the boss in a calm voice, never allowing him to get away with bad things, just be "large and in charge" with a calm but firm voice. If you need to add a hand clap, finger snap and a hiss, so be it. Just don't yell because that's a human bark and he will think barking is permitted. (OK, I've told them off with a human bark and they were so surprised they backed down quickly)

If you suspect he is just looking for attention, make him earn it. Some sits, stays, downs or whatever you are working on........reward with the lovin' he's looking for. Whatever he gets he earns by pleasing you.

If he knows you are in charge in your calm manner, he will mimic it (in time )

Lots of exercise and "work" (commands) help inforce who's leader.

Perhaps some training to do some "tricks" would help so that when a tantrum was starting his attention could be redirected into a learned (and acceptable!) behavior.

Is he food motivated? Does he go crazy for treats, beg at the table? If he begs at the table, does he throw one of these "tantrums" or does he just sit and stare or does he keep pushing his nose onto the table?

Does he bite?

To be honest I think almost everyone goes through this around that age. Rufus used to drive us mad with his behaviour, we did the things suggested but he would just bounce right back. It takes a while and persistence in a big way on your part, but it will work. Be prepared for it to take a month... maybe more... but just keep going with the calm authority and eventually he will settle down.

Hi & welcome, I have a 4 year old Chauncey
I really don't have any words of wisdom beyond what has been given.
He will get better it will just take lots of time and patience....did I mention patience
As for being hyper in the evenings, my Chauncey did the same thing, even with lots of play. Other members called it FRAP, and I can't believe I don't remember what that stands for, can anyone help me out?

He's actually very praise motivated. I learned that after making a huge deal out of him sitting when told to. So he really doesn't have to have treats. When treats are involved it actually distracts him.
When we eat our food by sitting on the couch, he does come up and stare at us - but that's when we put up a hand and say no. Once me and my husband do that, he lays down.
We're actually working on the dominance thing by pretending we are eating his food first before allowing him to eat to see if we see a calming in his behavior overall.
He does bite when he's being playful - I've decided to go the route of immediately when he bites - walking to a room and closing the door. It seems to force the message, "playtime is officially over".

Awww - another Chauncey - Mine is named after Chauncey Billups, the basketball player. I looked up FRAP, it's Frenetic Random Acts of Play (or Frantic Running And Playing). He was actually better with the playfulness tonight, although he still actively paces around the house in watchdog mode until he's satisfied and flops down.