One of my dogs doesn't have a aggressive bone in his body. He thinks everyone and every animals is in fact his friend. Not worrying about his friendships with humans, it is other animals that bother me. He will run up to any animal, other dog, cat, horse, domestic or wild, to him they are all his friends. My worry is that one day he will see a "friend" who doesn't want a new friend and he could get hurt. He is leashed on our walks , and we have a fenced in yard, but sometimes "friends" do find their way in from time to time. You would think being sprayed by a skunk not once but twice might have made him a little standoffish, nope not at all, even with the skunks.