The source of your quote (below) explains the passage. The horse considered the saddle to be a beautiful thing that it would prefer to have growing as part of its own body, rather than just being strapped on when needed. The outcome of these various changes being that the horse was turned into a camel!
Butterfly's Museum of Camels and Dromedaries
Many years ago a dissatisfied horse asked the gods for longer, thinner legs, a neck like a swan, and a saddle that would grow upon him as a part of his body. Admiring all these separate appendages of beauty, the horse longed to incorporate them all within himself.
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