i own a staffie (male) who is just over 2 years of age, he was socialised when young and gets on well with my other staff who is a bitch and is ten years old he also gets on well with my neighbours jack russell, sometimes when we take him for a walk and let him of the lead he will go for other dogs, but this doesn't happen all the time and just completely random the other dog can be really friendly but he still goes for them, or sometimes he'll bypass them as if there not there. he doesn't bite them more mouthing and growling, snarling, but it doesn't sound or look nice.