do this, put beans on a leash in the house. walk a bit, then stop, holding the leash in your left hand. with your right hand, press down on beans’s back near his tail, saying “sit:” he may resist, but push firmly until he is sitting. if he stays there a few seconds, that’s very good for the first lesson. pet him for this, and praise him.
now start walking again, repeat the stop, say “sit,” and push down on his back until beans sits again. keep repeating this until he sits each time you say that word, without your having to push him down. don’t let him lie down. if 