It's because according to Welsh legends corgis were the dog mounts of fairies and have a "fairy saddle" on their backs. The breed is quite old (about 900 years) and presumably someone liked the idea.
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From @dkmilon
It's because according to Welsh legends corgis were the dog mounts of fairies and have a "fairy saddle" on their backs. The breed is quite old (about 900 years) and presumably someone liked the idea.