To be honest they didn't really need more space, but they are changing daily and moving about more. The problem was that Jet was getting himself stuck under the pig bars, but after we removed them, there was no escape against the solid sides of the box. Anyway, I always change to a pen at about this stage, and no doubt they'll need even more space in no time at all.
Siska is doing such a wonderful job, the pups are well-fed, content, clean and comfortable. I change the bedding once a day, but to be honest, she keeps it spotless. Tomorrow we will be upsetting everyone with the first Panacur dose ... I hate doing it, but needs must!