There are only two reasons that I know of that Rusty doesn't want to go to the barn. One is THUNDER, which we don't have very often. Here is the other:  

Now that the rain has stopped (and, by the way, it is supposed to be in the mid-90's next week) this is Balloon Season. I had another Border Collie who was also afraid of the balloons. I'm not afraid of them but I resent them. If some of you like the romantic idea of floating around in a balloon then stop reading this. I don't want to tarnish your image of them and spoil your fantasies.

Ant Farm. That's what I feel like when there are balloons overhead. Am I supposed to look up from what I'm doing in the yard or the pasture and wave and smile for a photo? Or do I go about my normal work so "they" in the balloon can observe what we do in our natural setting? I tend to go in the barn and stay there until the balloons are far away.

This morning's balloons never made it that close, but for Rusty it's enough to look to the west and see this huge floaty thing that hisses and doesn't belong in the sky.