Bulldog Mix Aggression

Question
I have a 2 year old bull dog mix who at about one year started being aggressive towards other dogs.  He doesn't bite, he just barks and growls.  he's a real sweet dog with humans, he just is aggressive sometimes and to some dogs.

While at the park I will put him on a leash and walk away with him until he calms down and then let him go after a few minutes.

What can i do to break him of his aggression


Answer
Hi - Well, I am sure one of our Behavior experts can give you some tips: Take your question over to this person:
Sorry, I mostly answer bullie dog health questions or feeding questions...
OK
go here:

http://www.allexperts.com/ep/3553-100709/Canine-Behavior/Sandra-Case-MEd-CPDT.ht...