Re: How big of a wheel
Hi. The 9" should be fine for now but might be a bit small when he's fully grown - depending how big he gets. I wouldn't use a sandy track - it's bad for their feet. They can get sore pads and a nasty condition called bumblefoot. Better to just have a terracotta or granite tile under the water bottle so their nails are roughened every time they go for a drink. I do that and never had any problems with nails - not until our last hamster was very old and inactive and then they needed clipping.
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