Dangle the String - Cats
The simple act of dangling some string-like object above a cat never fails to provide endless entertainment for all parties involved. For a modern take on this classic kitty game, try bringing a laser pointer or a small flashlight into the equation.

Treat Treasure Hunt - Dogs
Show your dog a treat and "hide" it somewhere in plain view while he is watching. Then encourage him to find the treat - make sure you're super excited when he does, to establish positive reinforcement. Vary the hiding spots and try harder ones where he can't see it (like behind the couch). Once he gets the idea, you might be able to increase the difficulty, distance, and number of treats, until it's a true treasure hunt.

Grocery Bag Bonanza - Cats (and probably some small dogs)
Take some brown paper grocery bags (the kind without handles), or some old cardboard boxes and place them in different spots. Cats love to hide, so your kitty will be entertained for quite a while with these simple items. Incorporate toys and treats, or maybe a little catnip for a feline version of treat treasure hunt.

Tried-and-True Frisbee - Dogs
Grab a Frisbee and your dog, and head out to your yard or a local park. This is a form of entertainment that has amused both pets and pet owners for generations, not to mention its great exercise for both parties. To mix things up, try different ways of throwing the Frisbee – this will also challenge your pooch as he chases after your wayward throws!