Three types of dog, 1800.
© Science Museum / Science & Society Picture Library
Engraving by J Pass showing 'The British Bull-dog', 'The Old English Mastiff', and 'The Alco, or American Dog'. This last was 'a small South American dog, domesticated by the aborigines', or 'a native domestic dog of Mexico'. Illustration from 'Encyclopaedia Londinensis, or, Universal Dictionary of Arts, Sciences, and Literature' published in London, 1810-1829.