This is fun!
Snoopy loves to hate sqirrels most of all. They seem to know just how far his tie-out reaches, and stay just out of range. But hope springs eternal.
He also loves to hate the broom. He got into the habit of biting and growling at the broom when he would come in from outside. Sometimes he wants to go out, just to come in and attack the broom.
And trash bags! He can hear the trash being emptied from anywhere in the house. And I have to say, no one has been attacked by a trash bag since we got him.