We once tried out an invisable fence, Hannah was scared witless of that. We had to deactivate it.

Tucker is scared of sizable objects that weren't there before. It takes him a while to determine that these aren't going to gobble him up. He has another fear which we cannot figure out. He loves my husband and will sit on his lap and give him kisses, but he will not go outside if my husband is the one to open the door. He will not walk past my husband by the door unless I am with him. We didn't notice this initially because I was always the one who would let the dogs out, but after my husband retired, he started helping out. Well at least he tried. The only thing we can figure out is maybe at Tucker's original home he was kicked outside by the male in the family.