Does he get enough exercise?
Mine doest that all the time. I'd swear he needs to go out for a shit, and then he grabs a tennis ball and tries to play "catch me, I've got the tennis ball".
This usually happens more often when I'm buried in work(from home) and only have time for a morning walk.
BTW, don't play with him on his terms, only yours. If you really want to give him the play time he asks for, make him lay down for a few minutes. Then initiate the play session, or else you're basically his beeatch.
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