BILLY is a small boy: Bruiser is a big dog. They are great friends.
Billy gets on Bruiser's back, and treats him as if he were a horse.
Bruiser takes this as a good joke. He likes to have Billy play with him
in this way. But it would not be safe for anybody else to do it.
Bruiser is a grand watch-dog. One day the old dog gave a fierce growl to
keep off a butterfly.
He thought the butterfly was going to attack Billy. Billy had a good
laugh at this; for, small as he is, he thinks he is a match for a
butterfly.