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In page Galgo Español:

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In the first years of the 20th century, large scale crossbreeding occurred between the Galgo and the English Greyhound in order to create faster dogs for professional track racing. This certainly affected the purity of the breed as the resulting dogs were just a bit faster, but did lose their long-distance-running abilities. Finally breeders came to the conclusion that it was not worth crossbreeding.[citation needed] The purebred Galgo kept its major presence in the Spanish villages as an excellent hunting type.