WHAT DOES PUREBRED MAINE COON CATS FOR SALE MEAN?

I obtained her from a rescue shelter plus they didn’t even know the kind. The vet claims medium hair domestic cat but she's humongous and it has incredibly rather coat. I’m thinking of obtaining her tested to find out.BLACK SMOKE & WHITE: shade as outlined for black smoke with or without white about the face. Will have to have white on bib, bel