My dog wasn't properly socialised when I got her at 14 months. Combined with the fact that she has a mohawk on her back which makes her look like she permanently has her hackles up, that made her into a pretty anti-social dog. I mean, she'd stand over dogs and would regularly get into fights - though no blood was ever drawn and it was often impossible to determine if she started the fight or just taunted the other dog into attacking.
I had to learn that the only way to deal with it was to keep working on getting her to come when called under ANY circumstance. She's calmed down a lot now she's 10, but even when she was younger I still always gave her the benefit of the doubt and would allow her to greet other dogs off lead. But I would closely watch her body language and if there was any sign of impending bullying or aggression, I'd call her off. Behavioural "issues" cease to be an issue once you gain real control over your dog, if you know what I mean.
But dogs will be dogs and the vast majority of scuffles are all intimidation and testing eachother and no harm gets done. It's how they determine the pecking order...
Edited: thought I'd clarify that my dog only ever tried to bully dogs her own size. She's always been great with small dogs (once I got through to her that they were NOT rabbits