[DoctorTentonyya]

Allegedly,

Temperament: As with all large, active working dogs, this breed should be well socialized early in life with other dogs and people, and be provided with regular activity and training. Temperament of individual dogs may vary, the Standard says that the breed is "Good-natured and devoted towards people familiar to him, slightly suspicious of strangers."

which is the impression I got on a BMD's temperament when I was thinking about one.

Maybe the ones you know are nutty lol.

If that's for the entlebucher, I wouldn't call them large dogs other than their attitudes. They're probably 14-16in at most in height, at least for the girls.
I'm sure if they were trained properly they'd be less fruity.