Right. 'Good' means "good."

Canine can be insanely complex at times. Perhaps surprisingly, simple words had the most variations. Depending on the way it was said, 'good' could mean 'a nice warm blanket on a cold night' or 'you're quite accomplished at what you're doing' or 'seeing your mate after a long night's hunt'. Richard has instincts to help him decipher which was which.

River can only memorize.