He is FAR to big to be a purebred nethie (ideally a nethie will bebetween 2-3 pounds), so a mix, like the others said, is entirelypossible, no idea what though. But he sure is cute.
If there is tannish color at the nape of hisneck, he's a black otter. If he just has white at the nape ofthe neck, black silver marten. Hard to tell the color fromthe photos - some seemed like there might be tannish ticking, otherslooked very white.