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My Shiba knows his "spots" where he meets friends of his and what times we usually run into them. And when they miss those times he will lead us to their apartment because he knows which door they live behind. It's crazy.

Can maybe be something like a garbage truck.

Lucky guess! I take the garbage out on Thursdays :)

I doubt the dog is actually keeping track of the days. Definitely picks up cues from my own behavior based on the day/schedule, like taking the garbage out.

It's almost certainly something he does subtly different. The timing of making breakfast is different, or he cleans up more conscienciously, etc.

Not that dogs can't figure out weekly rythms, but they're much better at spotting subtle precursor behaviors