The thing is, Marco isnt that big of a dog. He's about the size of an Austrailian Cattle dog. I think he's only a quarter Pitt, but his behavior over trying to dominate other dogs is something I cant have.
My girlfriend's 6 year old son is autistic and epileptic. She wants to get him a seizure alert dog. If Marco doesnt stop his aggressive behavior, I will have no other choice but to give him up. I will do that for her son if i have no other choice.
Uh, I have a son with Autism AND I have a pit bull that is VERY dog aggressive. She's dog aggressive to a point where she can be around NO other dogs, except for one. And it's not just snarkiness. It's "I want to attack you from the get-go" dog aggression.
Anyway, my dog aggressive pit bull wouldn't DREAM of harming my son with Autism. My dog doesn't harm humans, and the day she does, is the day I will no longer have her.
Yes, I agree that you need to get a behaviorist who is, not only schooled in dog aggression, but specifically in bully breeds with dog aggression.
Pit bulls (and of course, pit bull mixes) are pre-disposed to dog aggression. Some may NEVER grow up and become dog aggressive. But, most pit bulls grow up to, at the very least, become somewhat less interested in dogs. Meaning, they don't SEEK OUT other dogs to play with and socialize with.
Now, pit bulls are also notoriously known for their genetic tendencies for dog aggression not to show until they have matured, which usually can occur between ages 2-5 years. So...being that your dog is now 2, it stands to reason why he may be becoming less tolerant with other dogs.
Trust me, it's not the end of the world, but your best bet is going to be to keep him separated from all other dogs, until you find someone who can help you learn to manage him with his dog aggression.
Please do NOT set your dog up for failure by being fooled into thinking, "Oh...he seems calm, I'll let him around this dog now" because chances are, he could do some damage to another dog and it can happen fast (as it can when ANY dog decides it doesn't like another dog) and, so, to keep other dogs safe, AND to keep HIM safe, do not allow him around other dogs.
I look at it this way: Just as my son cannot help having Autism, my dog cannot help being dog aggressive. It's genetic, most likely. At the very least, it's genetic with environmental triggers.
You cannot train dog aggression OUT of a dog, but you can manage it and work with the dog and, just maybe, one day your dog may be able to be around other dogs.
I'd link you to badrap's list of dog tolerance levels, so that you can read up on it, but their site seems to be down at the moment, or something.
BELIEVE ME,
dog aggression does NOT equal human aggression
Like I said, my dog is very dog aggressive, but wouldn't EVER touch a hair on my children's heads.