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Both genes can cause white at the bottom of the tail. Splash will usually show other white markings, starting from the legs up, depending on the amount of white factor.

For GP to show up, horses must be bay based--bay, brown, buckskin, amber champagne--and homozygous for GP.

If a horse that could show GP also has splash with lots of white factor, I'm not sure how you could tell about the GP, unless you could find evidence of it in the horse's ancestors.