This Instructable describes how to quickly turn a tennis ball into a puzzle toy for your dog.

Vegan Doggie Treats

Ingredients:
1 sweet potato (boiled)
1 extra ripe banana
1 cup oatmeal
1/4 cup coconut oil
2 tablespoons cinnamon

Directions:.................. 

via Hands Occupied

Supplies

105 inches (8.75 yd) of 1 inch-thick cotton rope
scissors or knife
dog treats
2 twist ties