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Nope page doesn't say that at all. Most arabs are red or bay so most flea bites are those colors. They come in black as well though. Fleabites are pigment storage cells regrowing after they where destroyed by the gray gene. Horses with only one copy of the gray gene are more likley to have fleabites.

Black on gray is the also the most likley to get cancer, followed by bay, then red. It's because pigment is a carcinogen and grays may tons of it. (Blacks making the most)

The mechanics of gray is actually pretty well understood. It's more complex then I have time to write up but the short version is gray horses make super amounts of pigment. That overloads the cells that store the pigment and kills them turning the hair white. No storage means no pigment to go in the hair. As horses get older some of those cells can regrow. Fleabites are areas where that has happened.

I'm assuming this is why so many greys get melanoma tumors? We lost a mare many years ago to a bowel ruptured by a melanoma rupturing.

Lp is the total opposite. It reduces calcium crossing into the cell and prevents pigment from being formed. Varnish stays longest on bony areas because of the additional free calcium floating around. (probably) That same calcium is needed in rod production in the eye. That's why all hom. LP appaloosas are completely blind at night. Het. Lp horses probably have some reduced night vision.

Thanks so much Ammit! As I currently have one old (20 yo) lpLp and one young LpLp (3yo) I find this very interesting and relevant.

If she produced even a single non gray foal than she was Gg.

Bloody shoulder is often an area that never grayed at all but sometimes is an area that recolors.