My husband's Malamute x Staffy, Lucatoni, loves gumnuts (big seed pods of Eucalyptus trees) - We have a lot of trees on our block, so we never run out of "toys". He also has two soccer balls. My little rescue Chi x just doesn't play at all. We have had him over 4 years and he still doesn't understand the concept, despite us trying. Bit sad, but I think he had a tough time of it before coming to our house.