Laddy is a 20 pound Sheltie, turned in as a biter. He has never shown
any sign of hostile, defensiveness, etc. He is timid, meek and
fearful--even after four years of living like a king.

Lately, and with some intrepidation, I've begun to play a little
rougher, turn him upside down (which he enjoys, if I pet his belly) and
so forth. It seems to be bringing him out of his shell.

I've done this with many shelter dogs, with great results! Now, I'm
trying it at home.

Its not enough knowing that it works; I want to learn why it works. So,
my question is: is this just luck, or is there some mechanism that
causes these dogs to come alive and lose their fear? Is it just a matter
of their gaining self confidence, building trust, etc.?



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Whatever it takes.