Appearance. The Griffon Bleu de Gascogne is a medium-large dog, 50 to 57 cm (10.5-22.4 ins) at the withers, with a distinctive rough (shaggy) blue speckled coat, drop ears that are not as long as those on other hounds, and a tail carried up and in a slight curve.. The colour of the Griffon Bleu de Gascogne's coat is the same as the Grand Bleu de Gascogne, white mottled with black, giving a ...