We adopted Dex at the shelter. He is a military working dog retired, for medical reasons. The only reason we know is his handler lived in the complex and junior kept taking us to his former home. She got closure, so did the dog. He is wickedly smart.

And these days we know dogs have enough cognition to “read.” Your instincts are correct.

A tad dated, but they are using buttons these days.

https://www.whole-dog-journal.com/training/teaching-your-dog-to-read/