A month or two ago, our wonderful dog walker, Mary, told me that Angus had grown fearful of the back porch. After the walk she couldn't get him to climb the steps to the back door and she finally had to resort to carrying him up.
Given that Mary likely weighs 100 pounds soaking wet, this must have been quite an endeavor. She is strong and wiry, but Angus weighs 62 pounds and he is not easy to lift. So I had to investigate.
I put Angus in the yard, and then I called him back. It was true; he refused to come up the stairs but instead ran around to the far side of the screen porch and barked pathetically. It took a while to figure out why, but eventually I did: He was afraid of a broom, which was at the top of the stairs instead of in its usual place, in the corner.
I removed the broom and Angus ran up the stairs and came into the house.
You would not believe the number of weird things that Angus is afraid of.
Today he barked at a motorcycle. Not one that was vrooming down the street, belching exhaust. A completely still and silent motorcycle, parked in a lot along with a couple of cars.
I'm not sure what about the motorcycle terrified him, but as we approached he let out a volley of barks and tried to hide behind me. I brought him closer, let him sniff it, put a small treat on the motorcycle foot rest. He leapt forward, grabbed the treat, leapt back. We moved on.
He behaved this way a few weeks ago, too, when we saw a bunch of balloons bobbing on the grass in the park, likely escaped from a party. He hid behind me and barked, we approached, I set a treat on a balloon, he grabbed it and jumped back.