The reasons for this preference are twofold: one, the Malinois is large enough to effectively attack an enemy while still being small enough to be picked up by its handler, and two, their coats are short and typically of a neutral to fair color, making them less prone to heatstroke.
There are two reasons for this preference: first, the Malinois is big enough to tackle enemies but light enough for handlers to carry; second, their fur is short and generally in a neutral or fair shade, reducing the risk of overheating.