I've often heard that dwarf boas (or most of them) can be on the feisty side, not as mellow as the larger ones...but if you really ask around & talk to the right*
breeders, you should be able to find the most suitable options. *You want one that really knows the personality of their offspring so they can steer you to the
one that is the most mellow of the clutch, as they can vary by quite a bit...so probably a breeder that is small to mid-size, not just mass-producing dwarf boas.