I have a strange problem. Our yorkie Buddy has decided he hates the neighbor's dog all of a sudden and tries to go after him. The neighbor's dog is HUGE and is on the other side of the fence. He mostly ignores Buddy, thank goodness, but they used to be friends--they are both neutered, by the way. It is so weird because Buddy will bark NONSTOP and won't even come back in when I offer him a treat---that used to always work in the past! He gets crazy and attacks the fence. I am afraid the neighbors are going to be really mad at all the barking and of course that the neighbor's dog will attack Buddy to shut him up. Any ideas? I wonder why they used to be friends and now this??