Mine all stopped except for infrequent occasions once both dogs were full adults, but were happy to play with new puppies that come in. What’s interesting to me, is that lately Cookie and Sassy play more with Chloe than they do with each other when their mom is not around. Chloe LOVES playing with her babies, but prior to this hadn’t played with anyone since she was young (she and Mulder played a lot when she was a puppy but he was 10 years older than her so that wore off when she was about 2).