Male dogs are about 61–66 cm (24–26 in), while females are about 56–61 cm (22–24 in) at the withers. Female Malinois are said to average 25–30 kg (55–66 lb), while males are heavier at 29–34 kg (64–75 lb). Dogs under 23 inches or over 27 inches are to be disqualified, as are females under 21 inches or over 25 inches.
Malinois can compete in dog agility trials, obedience, showmanship, flyball, tracking, and herding events, and are one of the most popular breeds used in protection sports such as Schutzhund, French Ring, and Mondio Ring. In America herding is a popular activity. Herding instincts can be measured at noncompetitive herding tests. In 2011 alone, the AKC awarded 39 new herding titles to Belgian Malinois.
Data refer : http://en.wikipedia.org/wiki/Belgian_Malinois