My puppy is about 8 months and I've read a few training books by now (we've had her since Feb.). I don't remember which one (maybe The other end of the leash by Patricia McConnell?) but the author talks about her puppy freaking out when she came in wearing a winter parka for the first time in her puppy's presence. Made sense to me. I try to remember that much of what we do or she sees is all new to Gracie! I came home from a grocery store trip carrying a big package of toilet paper and she went and hid in her crate!