It has taken a few months but Blue has finally learned that even though she can see birds on the porch at the feeder, there is still a glass door between her and the birds. And she only had to run into the door twelve or fifteen times to figure it out.
The birds, on the other hand, quickly figured out that she is somehow blocked and barely responded the last few times she went headlong into the sliding door.
I think of the size of bird brains and the size of dog brains and realize once again that size simply doesn’t matter.