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Hemming has managed to breed a "merle" pattern into him, which animal experts say is a genetic defect that is linked to blindness and deafness in dogs.

Mudis are also defined by its unique merle markings and "loyal" demeanor.

The female, two-month-old American XL bulldog is described as having blue merle colouring.

The popularity of dogs with “merle” coats — a genetic quirk that results in a dappled appearance that looks particularly fetching in photos — seems to have soared in recent years.

Opal, like many other dogs born with what’s called double merle genes, is able to use her other senses, such as smell and touch, to make up for what she can’t see or hear.