Like many of the others that have posted, I can't say enough good things about our Great Pyraneese! She is 16 months old and we've had her since she was 8 weeks. Bailey was born in a lamb pen, and came directly home to our lamb pen. We locked her up with our market lambs until she was a little larger, then introduced her to our flock of 20 ewes, 10 goats, and the remainder of the lambs. She is an excellent guard dog, and in addition to the sheep and goats, guards our chickens, cats, and children! (We live at the base of a mountain on 50 acres, and there are bear, cougars, and coyotes around.) She has lead us to lambs with their heads stuck in fences, and shows great concern when any of the critters are crying, including during vaccinations, etc. I have noticed she is a bit posessive, also, with her food, but we have that problem under control by feeding her in the barn by herself. She is a sweet dog, but is not allowed in the yard or house, as we don't want to confuse her about what her job is. She is very happy to do her job, and pretty much ignores our 3 year old Border Collie. We have no problem with strangers, as she isn't aggressive with people like she is predators. She loves people, even strangers, and if I have any complaint about her, it is that she gets excited and jumps on people she doesn't know. This spring was her first experience with lambing, and we didn't know what to expect. She loves the lambs, and licks them and cares for them like the ewes do. The ewes don't seem to mind at all, as they know Bailey well, and trust her. The ewes all follow her. When they trek down to our field below our house, first comes Bailey, followed by all the ewes. She stays with them, sitting on the hill keeping watch while they graze. Wouldn't be without a Great Pyraneese with livestock...they are wonderful dogs!