The Tervuren is a medium-sized, square-proportioned dog in the Herding dog group. Males stand between 24 and 26 inches, and weigh approximately 56 lb. Females are finer and smaller. It is recognized by its thick double coat, generally mahogany with varying degrees of black overlay (completely missing overlay on males is a serious fault), including a black mask. A small patch of white on the chest is permissible, as well as white tips on toes. The Tervuren may also be sable or grey, but this may be penalized in the show ring in some countries according to the standard of the registering body. While the FCI permits any type of red (mahogany) coat including pale yellow (sand colour) and grey the AKC has stricter rules regarding colour. While the FCI states that fawn/mahogany is to be preferred, grey colour is a fault under AKC rules.