Hummmmm.....I know my girl doesn't have any spots (cat tracks).....I don't believe he does either because they look almost identical to each other. So if they're not then what can the differences be? Just the pattern?
There is no way to tell by looking at the pattern if a horse is homozygous for Tobiano. In fact, I have seen a filly that is completely solid that has tested homo for tobi. The only way to tell if she is homo or hetero is to test her.