That is her "Blondie the Easter Pony" persona.
Yes, it's ridiculous, but Blondie has certain conformation issues that make more conventional horse jobs out of the question for her. Doing this, she puts smiles on hundreds of faces and helps to save the world from being overrun by carrots.
She has been a unicorn. For the Animal Costume Contest at our local fair, she has been the My Little Pony character Fluttershy, and her alter-ego, Flutterbat. I'm considering a "How to Train Your Dragon" character for this year . . . we'll see.
And this was her at the last Christmas Parade we took part in:
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Ohh, that's a hot-button topic, that one. She is a pedigreed (but not registered) Miniature Horse, and while some mini owners might start foaming at the mouth if you called their animals "ponies," if you could do a DNA profile on 'em, most Miniature Horses would show a majority of Shetland blood; some might even be 100% Shetland (as a matter of fact, I know some that are both registered Shetlands
and registered Miniature Horses). I'm sure Blondie doesn't care either way, as long as there's a carrot in it for her.