I wonder if anyone can help shed some light on some really odd behavoiur my dog is displaying. He is 7 year old Border Collie. He has hip problems - stiffnss and soreness, but is quite active. Recently (last 2 months) he has started showing aggresion towards people (lunging and snapping) thankfully he hasnt bitten anyone. He now gets walked on the lead all the time unless we are somewhere with no people. We can manage this ok. About a month ago he started growling when I give him food and when I walk near him when he is eating. He is normally a pretty cruisy animal. Last night he got very anxious, started almost burrowing his way into me or the good lady. We couldnt hear anyything which might be upsetting him. (My wife says he did this last Sunday night too). He jumped up on the sofa, which he has never done previously. When I commanded he get off, he didnt listen and when I moved him he went for me. Didnt connect but it was full on and close. He settled down immediatly, but was still anxious. Seemed ok when I walked him this morning. bowel movement looked normal. The missues says he is really anxious "with a look of terror in his eyes"today and she cant move anywhere without him following really close. Any ideas?