What about hiding some of his kibble in places indoors where he won't have to run or jump to find it and teaching him to seek it out? Several well concealed pieces of kibble can make a good game for a few minutes and he'll be using his brain.
William loves tennis balls but isn't allowed to retrieve them anymore since he was diagnosed with disc damage 3 years ago. Louis loves them too but he only gets to play with them if I walk him on his own.
Posted at same time as Steff. Great minds think alike