H, a harlequin great Dane and boo the Chihuahua at the launch for this year's Crufts dog show in Birmingham. Photo: Jacob King Expand

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H, a harlequin great Dane and boo the Chihuahua at the launch for this year's Crufts dog show in Birmingham. Photo: Jacob King

H, a harlequin great Dane and boo the Chihuahua at the launch for this year's Crufts dog show in Birmingham. Photo: Jacob King

H, a harlequin great Dane and boo the Chihuahua at the launch for this year's Crufts dog show in Birmingham. Photo: Jacob King

Crufts is to offer DNA testing to help identify health problems in dogs, amid controversies with over-breeding.

Owners and breeders can now avail of a “simple and cost-effective” cheek swab test, allowing them to check their dog for a number of different genetic mutations.

Telegraph Media Group Limited [2023]