What's the difference between an Italian Greyhound and a whippet? With their long, elegant legs and large, soulful eyes, these beautiful breeds look much alike and are often mistaken for one another.

A whippet called Miuccia has become the first Italian dog to win the top prize at Crufts in its 134-year history. The four-year-old pooch, from the island city of Venice, beat more than 18,000 ...