What works for your dog?

For my beagle, it was scratching her back. She looked like she was in total bliss every time I did that, and had weird quirk where she would start kicking one of her back legs up and down every time I did it. Eventually she discovered that she could go under our day bed and scratch her own back on the box springs. Sometimes she be under there for like an hour or so scratching her back amusing herself.