Well - I know that Bob Clark currently sells F1 & F2 pure Dwarfs. I am not sure about anything beyond that. Still the F2s are known to sometimes tame/calm down enough to be handled on a regular basis. If your friend breed him from Bob Clark stock - then he could even be an F3, which would be even better.
As for the cage defensiveness - that is something that I have heard many pure dwarfs tend to have, even the relatively calm ones.
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