For nearly five years Anna Lamb, 36, has struggled with depression. She has sought help from doctors, taken various prescription and over the counter medications, vitamins, and an array of natural remedies all in an effort to control it. What has perhaps been the most welcome and effective antidote to combating her depression, however, came to her by chance in the form of a neglected, seven year old border collie named Mike. A friend of hers who is active in a border collie rescue group convinced Anna to bring Mike home and care for him. "It was hard to live alone," she explains, "hard to come home at times. The only thing facing me was cleaning, the television, the computer, the telephone; no other living being. Mike has changed that. It