Tiniquines are bred by a specific list of genetics. It's not a guess what you get kind of things. If you breed a palomino to a palomino you aren't going to get a leopard appaloosa or a dapple gray, you're going to get a palomino. Every foaling is based upon genetics. The foals will have the combined genetics of their parents and grandparents.
On the pages underneath, on the links menu, you will find each is labeled according to what it's based upon. Example would be fantasy genetics, facial markings genetics, or coat color genetics. Each of these pages will explain what that specific area of genetics a tiniquine has if it has that gene in it's genotype.