Originally Posted by MacabreMikolaj
As a note, albino has never been found to exist in horses, so if you're seeing albinos then yeah, they WOULD be the rarest!
That is exactly what I was thinking! There's dominant white, and maximum sabino. Both look albino, but genetically aren't. I did some research on genetics recently, and some scientists recently (within the last month or two) put out some info on albino. If I remember correctly, they said that they discovered a way that horses could be albino(it was thought before to be 100% impossible), but there has never been any record of it. They also said that the creme dilution gene results in a partial albino. So Buckskins, Palominos, Perlinos, Smokey Black etc are technically partial albinos.
Anyyyyway, I live in Thoroughbred country, so it's mostly bays and chestnuts. However I'd say bays are a tad more common. (By the way, for whoever it was that had asked if bays were dominant, yes, they are. It's the agouti gene over a black base coat. Agouti is dominant to black, and technically it's dominant to red too I believe, but since it doesn't act on a red base that doesn't really matter...) Greys are also extremely common around here. Paints/pintos and Creme colors (Palomino etc.) are also fairly common. Rarest color (excluding patterns, like Brindle) would probably be grullo. I've only seen one I think in the last 9 or so years.