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Sorry RolyRocks, I missed your last post, brain not working!
As Luna said a wheel around 20cm is about the best size, all mine have the silent runner which is 9”. I have a trixie wooden one that is quiet & I think they’re generally pretty good, wood does need to be painted with plastikote though as just about all dwarf hams pee in the wheel.
All my Russians have enjoyed being handled & having out of cage time, I’ve only had one female Russian & she really didn’t like hands in her cage & would bite but out of the cage she was absolutely fine, I do think this tends to be more of a female thing as by instinct they have more reason to protect their territory whereas the males aren’t so bothered.
When you say dwarf I’m guessing you’re thinking about a Russian?
Using sand as a toilet is normal too, you can just sieve out any clumps, they do love to roll around & dig in it too & it helps to keep their coats in good condition.