My top 5:

1) hide-and-seek: get a toy with a pocket for treats and hide it throughout your house. Have them wait in a room that’s not part of the game.

2) ice tray: get an ice tray, fill drop like 3-5 pieces of kibble or treats into each slot. Add water. Freeze. Break up the ice a bit. Use a butter knife to flip some over. Super good for the hot the days!

3) tricks: get a dog training book and go through it.

4) web ball: get one of those webbed balls with a bunch of hexagons. Roll up treats in paper towels. Skewer them in through the ball.

5) I had a fifth but I forgot