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You can breed warmbloods to ponies and get ponies, but it's not absolutely guaranteed. (You can breed ponies to ponies and get warmbloods occasionally, too.) Whether they're listed as WB or SP depends on their height, naturally, and when you breed there's an element of randomness to how tall the resulting foal will be.

Rabicano is a pretty easy gene. Horses that are heterozygous for it (listed as Rbrb or rbRb) have a 50/50 chance of passing it onto a foal. If you breed two heterozygous horses together, they have a 50 percent chance of having a foal with one copy of the gene, a 25 percent chance of the foal having two copies of the gene, and only a 25 percent chance of the foal not getting rabi at all. (Actually this is how all of the genes in the game work when it comes to heredity, or 'breeding for' the gene. Some genes are lethal in their homozygous form, or when they have two copies.)