Unlikely.Having white sandwiched between color on the top and bottom the way he does is typical "frame" patterning; the hallmark of Lethal White Overo. Breeding two horses like that together would be asking for it.
@Peep_Show the pawmarks are a sign of a horse that is homozygous for Tobiano; this horse's markings are typical of a different spotting pattern, namely Frame (LWO). Ermine spots are those little black spots that occur on the lower leg, often just above a black stripe in the hoof.
(Sorry, guys; I know I can get really tiresome on the subject of horse color. I used to lurk on a forum that was dedicated to the subject.)