My daughter had both a Pembroke Welsh Corgi and a Great Dane at the same time. Poncho, the GD, lived an almost unheard of more than 12 years, but finally got completely down in his hindquarters. A sweetheart of a dog. He had two surgeries to correct his stomach "turning over" a year or two apart, but had no othe real problems. The two got along very well together, along with a Boston Bull Terrier--all three neutered males. She's had three corgis and loved them all. However, her Rhodesian Ridgeback (gotten as a small pup after the Great Dane) doesn't like either the Corgi or the Boston Bull Terrier, all three neutered males, so she's going through very difficult special training.