For some strange reason Boots is deathly afraid of trash bags. At home he is ok and wont react, but when we're on our walks any trash bags on the side of the street, he will freeze up and wont move, or try and pull to run away, tail (nub) tucked between his legs. I cant even ignore it and keep walking, because he is pulling in the opposite direction for dear life. Poor boy. guess time and age will help him grow out of it.