From what I have seen the dogs are aggressive when (a) they are protecting their litter and/or (b) bikers regularly spook them by zipping past them very close a

From what I have seen the dogs are aggressive when (a) they are protecting their litter and/or (b) bikers regularly spook them by zipping past them very close at high speed and hitting them. A-priori they cant gauge if anyone is a threat to them or not. However, a clear demonstration that you are not a threat to them and that you are relaxed enough to hold your own ground diffuses the tension. They are more prone to territorial barking at night, but that's them being good watch-dogs. I have a rescue from the streets. He is paranoid about bikes and cars coming close.