Can anyone refer me to a trainer for aggresion problems? My sister has a seven year old terrier mix with some pretty severe aggresion problems. The dog has chased down joggers, knocked the tree trimmer out of a tree, attacked her DH and growled at the grandchild!! I sent her a few books but she needs hands on help. She was in denial about how bad things were but is ready to get help. And yes I told her to get the dog checked out for any physical problems just in case. This has been going on for SIX YEARS!! Can't imagine living like this for her and her family and the poor dog. I'm so leary of trainers since all you have to do is call yourself a trainer and VOILA!