Two dog owners meet along a dog walking path. Each has a dog that is off lead and not walking to heel, so each dog is perhaps a few metres from owner. Dogs are not too different in size, they meet and quickly become quite boisterous. There is some growling and chasing for a few seconds before the owners grab their dogs and continue their walk (in opposite directions). One dog ended up on top of the other, neither dog was harmed.
So, when is behaviour "boisterous" and when is it "aggressive?" Do you think it depends on your experience with dogs? Or the type/size of dog you own? How do you feel if your dog gets into a short-lived scuffle with another off-lead dog on a walk? Is it fair enough to write off incidents like this as "dogs being dogs" and "just play?" Or just unfair on those of us with placid dogs? Is it all just part of being a dog owner?