I haven't seen very many of these (if any) so I thought I would ask and see everyone's opinion on the hybrid offspring of a diamond dog and a pony.

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I haven't had one commissioned yet, but described a couple in my stories. They have the basic Diamond Dog body, with a pony head, a pony tail over a core that's a Diamond Dog tail, pony lower hooves and a coloration that can be ponylike rather than mineral shades. No horns or wings, no matter the pony parent's race. And no Cutie Marks; there's a whole PSA about being nice to Diamond Ponies as respectable members of society.