The Belgian Mastiff is a large, powerful dog that stand between 69 and 78 centimetres (27 and 31 in) and weight between 45 and 50 kilograms (99 and 110 lb).

[1][2] The Belgian Mastiff's coat is short, smooth and loose fitting; they are typically fawn or brindle in colour, with dark masks and white markings also known.

[1][2] In character, the Belgian Mastiff is described as a tireless worker with strong protective instincts; they are not known to be particularly friendly to anyone but their masters.

[1][2] The breed was seen throughout Belgium and the Netherlands pulling carts, often delivering milk, butter, meats and vegetables.

[1][2][3] The Belgian Mastiff's role as a draught animal became increasingly obsolete throughout the 20th century and the ravages of the two world wars further took their toll on the breed.