It's the effect of repetitive training, but it's always amazing to see how well they understand

Besides commands like "hand," "sit," "spin," "nose," "face," "house," and "walk," if I say "let's go for a walk," they go straight to their clothes hanging on the drying rack. When I put the leash on, they lift their legs up one by one, and when we're playing fetch outside and I say "last one," they bring the ball back and return lol. Even though I'm the one training them, it's always amazing.