I have a (bought-in) Shetland ewe who cleared a standard hurdle from standing two weeks before lambing (although in the end it was 4 weeks for her, but I didn't know that at the time)... still.
No idea if I can keep her, as she also often refuses to come into a pen and yesterday thankfully the shearer had his dog with him....
Shetlands will go over and under, but I have to say, my homebred ones don't jump.