I have a 45 lb 3 yr male Boston Terrier which we fixed at 2 yr. Buddy loves attention and loves people and loves to run around BUT sometimes he has unpredictable behavior in the off-leash dog park and we don't know how to correct it.

Scenarios

1. Weak/submissive dogs or dogs who he wants to play but who are ignoring him - sometimes he will fixate on one dog, maybe a puppy who is scared to be in the park, or a little dog hiding under the table, and he won't leave them alone.

2. Dogs who he wants to play but who are playing with a different dog - he will get in the middle and force the situation physically by breaking up the play between the 2 dogs and basically just jumps in.

In these 2 situations he will start out nice but then I think he gets a little over-excited, the hair sticks up, he starts barking etc

I must first say that this behavior has never resulted in injury to another dog and that i think it's just a bit of posturing BUT it is uncomfortable for us because we want our dog to play nice with the other dogs, which he does 75% of the time.

I just don't know why that other 25% he gets pushy. Any ideas?