Tika, growing more bored by the day as I try (and mostly fail) to work more hours and get more nondog stuff done and do it offsite (meaning not at home), has taken to inventing things to bark at. I don't recall previously that crows floating on the wind in a circle above our yard were objects of barkification. Apparently now they are, as are their brethren hunkered down on the antenna atop the chimney atop the peak of the roof of the 2nd story of the house. She was leaping into the air to bark at, and attempt to reach, the birdie birds.
This can be annoying.