Usually while watching TV my dog comes over with a tennis ball wanting me to play fetch with him. I usually throw the ball for him a bit until it starts getting really wet and then I start pushing him away. Recently I noticed he stopped coming to me to play fetch. Turns out he found another way to get entertained and it didn’t require him coming over and begging me to play with him..
What he has been doing is taking the tennis ball and going over to the edge of the stairs (I live in a duplex) and letting the ball fall down the stairs. He stands watching it fall down then once it hits the bottom he runs down, picks up the ball and goes back to the top to start all over again. Its amazing how little it takes to entertain him.