I never produced blue dumbo's, so can't speak on that. My blue hoodeds were pretty sweet, but my russian blue was pretty skittish.
Right now I have a litter of Agouti's that are NUTS! One made a death leap from the breeder tub, and has been running loose for 2 weeks now. Cats haven't caught him yet, and I've only seen him once. I thought he was too young to survive (his sibs were still nursing), and the only way for him to get to water is to go to the dog or cat dish (in which case they'd catch him).
I "think" I caught him one time in a live trap, but I found it disassembled in the kitchen floor, so I think the cats inadvertantly released him!