Mother Nature determines exact size, location, shape and pattern of markings. Since there is no such thing as Build-A-Bear for living creatures, the main goal should be choosing to adore a sweet, smart, funny, healthy, well raised puppy.  This I can give you!  We can usually get pretty close on the cosmetic factors you are envisioning.  For example, if you are on the waitlist for a red abstract puppy, you will be offered a red puppy with white markings.  However, very specific requests about placement, size, or shape of markings may not be possible.