I am pretty sure Bennie will run off any intruder, without bothering to learn more about them first. He goes after anything except "birdies", which are a strict "leave it!". Vultures, hawks and turkeys are too big to fall into "birdie" category and are chased off, so are hares and squirrels and the fox. He did go after the bobcat that one time that it showed up here in broad daylight (it had fled over the fence already after seeing me) and asked to be allowed to chase it past the fence along the creek bed (permission not granted), so I have no doubt he will go after it, especially since it's a cat (the resident cats are kept to their own fenced in area at their owners cottage or the barn when Bennie is out).
I was just wondering if a bobcat could be expected to high tail it pretty consistently if you hex a singl farmcollie on it or if it might try and fight for a chicken dinner...
He saw the bobcat and it moved. Makes job easier.