Vis-à-vis training ...

As once upon a time I mentioned in a books-to-read thread, have a gander at Gwen Cooper's Homer's Odyssey : A Fearless Feline Tale or How I Learned About Love and Life with a Blind Wonder Cat (a New York Times bestseller from 2009).

He taught himself to use a human's toilet, obviously without being able to visually monitor a human's use of same — which freaked out the author. And that's just the tip of the iceberg.