Ok. My Dumbo had a litter Xmas day. 9 gorgeous little pups. The dad is a Double Rex (always has hair on his face-sometimes more. Sometimes less. He also has very sparse hair in patches over his body, but looks hairless at a glance). Anyway, 3 of the pups have straight black fur and whiskers. 6 of them have curly whiskers and a very thin coat. I think these would be single Rex? Or am I mistaken?