Muffy had a fun game of tag worked out with the neighbour's cat. Spooky a sleek black cat who seemed to own a key to our house (he always found a way inside...ghost-like). He was was raised with Muffy's litter mate so he had no fear of dogs.
Spooky would stalk Muffy, then leap on his back for a short joy ride. Then he would jump off and Muffy would chase him. The chase would last until physical contact was made. Then the cat would chase the dog until physical contact was made. It was highly entertaining to watch the 8 lb. cat chase the 35lb. dog! Yhis would continue until they collapsed together in an exhausted heap.
Dogs and cats certainly keep life fun!