My mother's new puppy (yapping little thing) has been barking at her own reflection in the windows for some time, but now she's taken to barking at a painting (not even a photograph, mind you, a painting) of the older dog that hangs in the hallway. Does this indicate poor eyesight or lack of brains?

We did once have a cat that used to growl at a small tiger statue on the mantelpiece too. It never got used to it.

My parrot used to attack his reflection whenever I showed him a mirror.