Possessiveness of toys

Question
Buddy is a 3 year old mix of who knows what. His outstanding traits are those of a Jack Russell and Mountain Feist, with the Mt. Feist being the dominant. Buddy is very playful, affectionate and usually even tempered. When my wife and I recently presented him with a new stuffed animal to play with, he loved it. When we approached him to take it and put it up as it was time to go to bed he became very possessive and agressive. He has sometime become agressive when interacting with other dogs but I could stop him with vocal commands. When he did this, he didn't respond to the commands. I didn't raise my voice at him, I went and filled a pitcher with cool water and upon returning to the living area where he was (on the floor, not the couch or a chair) and to his surprise, doused him with the entire pitcher of water. He immediately retreated from the object as he was very surprised and I think had his feelings hurt. How should I handle this in the future. He has not been given that particular nor any other toys to play with since then. Please help!

Answer
Hi Reagan;
Shame on you for dousing him with water!
That was mean.
I have no idea what a Mt. Feist is, but I am a bit familiar with Jack Russels.
Guess thie is his baby, and he DON'T want to share!
But, you have to be the Alpha. If you let him get away with dominating in one area, before long you will have a spoiled brat that rules the roost.
He's little !
When he gets aggressive, pick him up buy around his middle, so he can't bite, chew his butt out royally while you take him to time-out
Time-out in my hiouse is a small 5X5 bathroom area, with no room to do anything buy lie on the bath mat and listen to everything else going on, and be bored.
First offenses are 30 minutes each. If the bad behavior continules, the time-out period gets longer.
When mine do right, I praise them, and tell them what smart babies they are, and how proud I am of them. when they misbehave, I scold ( read that, NAG).
They don't like to be nagged or scolded, and they DON'T like time-out.
Just the threat of time-put is enough to make thewm straighten up and behave.
If you could go to basic obedience clases with him, this would be benefucial to you both, and the trainer, after observing him in class, could recommend any further steps you might need to take, with him.
Jack Russels are a bit hard headed, and like to rule when they can.
Now, go tell him Daddy is sorry for hurting his feelings, and start school. LOl
Charlotte