Wouldn't have thought of it unless you mentioned it. They're too cute!!
I'm pining for a Border Collie - totally impractical at this point in my life. I want a super-intelligent dog who will happily run around keeping my theoretical heritage sheep (whose fleeces I'll spin and weave into blankets) and couple of dairy goats in order, and who will keep the foxes from the heritage chickens and turkeys. I've always liked Border Collies, never had one. I can always dream ...
Of course, a donkey or two could also do a great job of guarding the poultry ... but would end up 'mistaken' for a deer in this neighborhood, at some point.