variable are dogs. The house lab, Fifi, will bark in an overenthusiastic manner if there is people in the house and someone knocks on the door. If there is no-one at home - not a peep because - well its on its own and that's scary.
On the other hand I know one malinois that would draw your leg through the letterbox and play xylophone on your leg bone with its teeth, and that's just the friendly playing greeting.
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