Perhaps you mentally tick through a list of the errands or chores that might have sent you into this room at this moment. Sometimes you draw a blank.
It happens to Lilly.
Especially as her hearing has grown -- ahem -- less acute, I sometimes find her frozen in place, as if cast adrift in the back bedroom. I haven't been able to watch very long -- her determined little form plucks at my tenderized heartstrings. I clap or call her name, or stomp to get her attention, and she turns with an expression of relief so sincere that it's with difficulty that I resist the temptation to pick her up and squeeze her.
She is an elderly dog, after all, and has never enjoyed being separated from the solid ground, regardless of my little firestorms of affection.