we adopted a 2.5 year old sheltie this last week. As far as we know he was brought in voluntarily by his last owner. He is very shy and cringes when you try to pet him. We are wondering if this is a sign of abuse? When strangers come around he will hide, the other day he was so scared of my father-in-law he tried to run up the stairs so fast he was clawing away at them. We've had him for about 2 weeks now and has yet to really open up to us. Is this just the shyness of the breed or is this a result of something else?