Did the lab test for anything else, Mona-and as already asked, is he hetero- or homozygous? That indeed WOULD make a difference-as I'm sure you know, if he's homozygous, you're going to get some form of tobi no matter what the mare's pattern. I don't even recall whether it is possible to determine by this kind of genetic testing whether a horse is carrying sabino or splash??
Interesting that neither of his parents appears to have any white facial markings(as in, according to some, meaning they would have 'only' tobi?-on the other hand,as far as I can see in the photos,one or both parents have at least one white leg marking-so, does this mean that facial markings are totally 'separate' from leg markings, genetically, whether they are or are not part of the tobiano gene "package"??? Anyone know ?) Is the area on his penis a DEFINITE spot of pink skin? I do not know whether it means anything(where's Sarah??), but on my gelding, it is a very definite, sharply-defined, pink spot of skin-as you would see under white hair on a true 'pinto' body marking. I 'assume' it to be from sabino, as that is what's in my gelding's background-there is not even a HINT of tobiano--frame and/or splash--perhaps, and certainly sabino, but NOT tobiano. However, perhaps such a definite spot would also be possible with tobi???
Ah, these color/pattern topics--sometimes, they bring up more questions than answers!! Fascinating subject, though!!