It’s important to know this – the dogs on the photos aren’t fighting. It maybe looks like it, but in fact it’s female dog (who’s recently been in heat) warning male dog not to try and jump on her. He will run away and try his luck again.
Both are American Staffordshire Terriers and are beautiful and lovable pet dogs with no trace of aggression, like many people seem to think when they see them. It’s much more likely you or your dog will get bitten by a poodle (my dog does at least, regularly).
Staffs are greats dogs! This is not their real face, just a mask used for these situations when the female dog isn’t in the mood. :)