As a mammal species the dog is the most varied in shape, size, and colour, and also the most versatile, whether working as a hunter, protector, or simply providing companionship as a domestic pet. 100 Dogs celebrates this diversity with one hundred postcards with stunning imagery by contemporary animal photographer Astrid Harrisson, whose striking, beautiful, and unusual images of our major dog breeds skilfully reflect the virtues of 'man’s best friend.'