White Hooves Vs. Dark Hooves

Some say horses with white hooves are weaker than ones with darker hooves. This is not true though, as hooves are merely always the color of skin pigment (color of skin) above them.
Basically: a horse with a white skin above the hoof will have a white hoof on that leg - if a horse has a darker colored skin pigment above his hoof, that hoof will have a darker colored hoof on that let.
There is are also two sayings (which aren't true) that tells people 'advice' on buying white-hoofed horses.

The first one:
One white foot - buy him.
Two white feet - try him.
Three white feet - look well about him.
Four white feet - go without him.

The second one:
One white foot - buy him.
Two white feet - try him.
Three white feet - deny him.
Four white feet and white on the nose - knock him in the head and feed him to the crows.

As you can see here, the first five hooves are completely white (from left to right). That means that beneath the white hair, there is white skin pigments (as usually is for white hair). Then the last hoof (bottom right) is dark where there is darker hair (with darker skin pigments underneath), and white where the white hair is (with white skin pigments underneath).

This hoof is white; therefor it has white skin pigments above it.