It's also possible that the breeder checked him because he was still growing, but since the doe was more mature, she felt reasonably assured about what was going on there. The line of Dwarfs I referred to was the first time I'd ever seen mouths go "off" past the age of 3-4 months. I'd always seen signs of trouble well before that age previously.
Amy - Harlequin is a breed, but it is also a color (or more specifically, a pattern). When the lighter color is fawn or orange, we call it a Japanese, when it's white, that's a Magpie. So a Black Japanese is black and orange, and a Blue Magpie is gray and white. (That's how it works in the US, anyway, I understand that in Europe, the Magpie is a separate breed). Some breeds like the Mini Rex and some Lops come in tricolor, which is genetically a broken harlequin, but the plain harlies aren't showable in those breeds. Some people enjoy breeding a certain breed/color, whether it's showable or not, and this is the case with the harlequin Dwarfs. Even tri's aren't recognized in the Netherland Dwarf.