My seven month old sheltie is not fearful of people and other dogs. She immediately gets along with people and dogs she meets in her day care, vet office, pet shop, groomer’s shop etc. She never even barks when we have visitors at home. But she is almost neurotic with large objects such as trash cans, mail box, window blinds, etc. I tried to get her used to these things to no avail. I can’t take her to get mail, push out/take in my trash cans. If I open a mini blind in a room when she’s around, she will immediately run out of the room and will be fearful to enter the same room again. To condition her with the blinds, I tried to hold her in my arms and raise the blinds gently and slowly. I could feel her body trembled with every 2 inch movement of the blinds. Last week, we had some roofers at home to replace my roof. She’s Ok with the roofers, but when a big tarp was raised on top of the roof, she happened to be in the yard with me and saw the tarp. She was on leash but she was freaked out and wiggled her head violently out of her collar and ran away as fast as she could. I wasn’t able to catch her. She never even stopped to look back once because she was so scared. She disappeared for more than two days. I distributed missing dog flyers to my neighbors, vet offices, pet shops, grocery stores etc. and contacted all the animal shelters within 30 miles. Because she wiggled out of her collar, she was tagless. I microchipped her but it’s not the kind with GPS tracking. Eventually, one neighbor found her two days later and she was returned to me. The first thing I bought after the incident was a martingale collar and now she’s double collared. It had been a big scare for the whole family for two days. I am wondering if this fearfulness is common among shelties. My previous American Eskimo dog was not like this at all. I got my sheltie from a reputable breeder (AKC breeder of merit) and her dogs usually have very good temperament.