For the people who have moved to the belgian malinois, how have they fared as family companions? I looked at them initially but many said they're ill suited to family living and are predominately for working only, and can be fear-aggressive. I'm after an athletic and intelligent dog that could become a regular running partner, in conjunction with lots of time spent at the dog park and obedience training. Also, is there a great difference in temparerament between the variations of the breed, i.e groenendael, tervuren etc?