I really don't think Clover will tell him when to stop. They play for really not periods of time without her doing anything. Sometimes she'll try to hide under someones legs if they're sitting near by. She's pretty submissive. If I pull him off, she doesn't go after him to try and keep the play going (maybe sometimes if she's really in the mood to play) mostly she'll lie down or try to play with a toy. Also, ANY time she is playing with a toy he comes and grabs it out of her mouth and runs off with it. If she picks up a different one, same thing. Again she won't put him in his place. I feel bad for her...

Clover and Zeke know sit/stay and even "go to bed" but it's pointless if the puppy isn't going to listen. He's slowly learning but play time is much more fun then treats.