This is most commonly seen in Chesapeake Bay Retrievers, St.Bernards, Great Danes, Newfoundlands, Collies and Labrador Retrievers.

• 该疾病最常见于乞沙贝克猎犬、圣伯纳犬、大丹犬、纽芬兰犬、柯利犬和拉布拉多犬。