Food guarding and territorial aggression is a common problem with smaller dogs in a pack situation. I had a westie in rescue who was like this. If I went near his food bowl, he'd run to it, stance me and growl. I took quite a few bites from this guy trying to rehab him. I fill 10 bowls with kibble and placed them all over the house. He spent the first few days running from bowl to bowl before he figured out he cannot guard them all and just gave up.

As for his aggression to other dogs, clicker training comes to mind here. Place both dogs on a leash with a harness. Have the boxer sit or stand in one spot and walk by her with your Yorkie. When he attempts to charge the boxer, pull him back gently and tell him NO! in a firm voice. When he walks by nicely, use a cue like "YES!" and give him a treat. Positive reinforcement will go a LONG way with any dog.

I'm also thinking the dogs need to be separated and reintroduced slowly. Perhaps starting over would be a good idea. They haven't had the chance to get to know each other. As far as your Yorkie is concerned, the boxer is invading his territory and he needs to protect his family by running him off. To train a dog, you need to think like one.

PLEASE check into clicker training. 15 minutes a day/ twice a day will yeild fabulous results with a dog you will adore in the end.

Excellent advice!!!! :thumbup::thumbup::thumbup:

I am sorry your having such issues with your dog.
There are many dogs that require a home with only them in it.
It sounds like he is very unhappy, stressed and has no confidence
at all. I would find him a "One Dog Home" ASAP so he can
enjoy his life.
Good luck,

P.S. Getting neutered dosen't change behavior immediately.
Perhaps in a month or two there might be a slight change
but only toward his sex drive, which can cause a male to go
nut's if a female in heat is anywhere in the area.
Personality changes are not corrected by neutering.

I would agree a one dog home would be best for him. Most dogs love companions but there are always one or two that are better off on their own. Please don't put him down, he doesn't deserve that. He just needs a home where the person has all the time for a dog to do some training and work with him on it.

Shock collar never solve any problems. They get worse with it.

Get the video Dog Whisperer Cesar Millan, it shows where a dog is very aggressive and how Cesar control it.