Cardboard maze for the playpen, total cost about two pounds. Four cereal boxes, a roll of tape and a pair of scissors. He spent forty minutes in it the first night and now runs straight to it the moment I open the pen.

I have now owned four wheels. Here is what I would tell my past self.

The single rule that matters: they have to run with a flat back. If the spine curves while running, the wheel is too small, no matter what the shop label says. For a dwarf that means 20cm minimum, and honestly...

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Paper is cheap and easy to find but it does not hold tunnels at all in my experience.

Hemp seems to hold shape better. Anyone compared them side by side over a few weeks?