OP and I play hide-and-seek and Where's the Biscuit. For Where's The Biscuit she'll go over to where the cookie jar is and lift her paw to point at the biscuits.

My smartie girl will only find her tennis ball though. She's also very picky about fetching only HER tennis ball...a replacement ball will not do. We play Hide-and-Seek like this: I say OP sit, stay...show her the ball...then go to another room and place it somewhere easy. Walk back to her. then say, "get your ball." She loves playing this. Each time I make it harder and harder, but she pretty much finds it every time.

She is also really good at finding tennis balls outside when we're out for a walk. She'll suddenly veer off a few feet or yards, sniff around and then bring me back a lost tennis ball.

My DH likes playing Dork the Ears...silly silly man.