Okay, I think I'll start off in a jar or a critter keeper.
I have a dog but it never comes into my room( too small) and it can't get under the aquarium stand anyway. How fast do they grow?
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Make sure that the holes are small enough that it can't escape.
They grow about this fast:
You're looking at a tarantula with about a 6" leg span after one year, and up to a 10" leg span later on.

