We have an 8 year old yorkieshitzu. He's a well socialised, outgoing little chap. Loves his forest walks with his dad, and gets on with most dogs. Those he doesn't take to, he just ignores. The only thing that seems to wind him up, is timid subservient dogs that crouch down and cower around him, but he's never ever tried to bite. He just warns them off. Today my husband was walking him as usual in the forest, and they met up with 3 little dogs that he loves, at the same time, two black labs ( that he also knows) joined the group. One is a youngster, the other one very elderly and slow. Ours went straight at the old boy, who was minding his own business, and my husband said he was actually worried he was going to bite the old ones throat. Needless to say, he grabbed ours, put his lead on, told him off and took him away. Just not sure where this has come from - he's NEVER tried to bite before, and from what husband said, the old boy did nothing to deserve this. Any clue anyone? Honestly, I would have said he doesn't have a bad bone in his body!