There is no long description. But if you actually want the description of his nightmare, then read the darned story.
~~ Snowhead W. Blitz

Snowhead Blitz is an anthropomorphic wolf who fell through a portal in his home universe Arvaelie, to the universe where Equestria resides. Falling into that world, Snow is transformed from an anthro wolf, into a pony who has to get used to his new form, while trying to fend off the dangers that followed him. Along the way, he runs into the Main 6, and together they battle for the sake of Equestria!