We have kept the pups in a smaller pen since we got back from our trip to allow Ace to remain with his littermates without them being too rough with him. It has worked splendidly! He is starting to eat regularly again and is back up past 1 lb. I will take an ounce anytime after his sugar drop! He is less nappy and really starting to play more.
They have pushed the doggy bed up against the door of the pen and use it to peek out at us, begging with their eyes to play. I would say they have earned a chance for a larger play area 🙂