Think of a fewspot as a "fewspot leopard". If you shave him down to his skin and get him wet, he will have spots everywhere -- just like a leopard, but they will only be "skin deep". That's one of the tell-tale signs of a fewspot. They are only spotted on their skin -- not their coat, although they may have one or two spots that you can see. But get him wet....and you'll see hundreds of spots!
When people go to sell fewspots, or what they call fewspots, I always advise people to have them clip the horse down, wet it and take a picture before buying.
Here's what I mean. This is "Snowy" a fewspot leopard.
First dry, then wet down.
See what I mean?