WHAT DOES PUREBRED MAINE COON CATS FOR SALE MEAN?

I obtained her from a rescue shelter and so they didn’t even know the type. The vet claims medium hair domestic cat but she's humongous and has really fairly coat. I’m pondering finding her tested to determine.BLACK SMOKE & WHITE: color as defined for black smoke with or without white within the face. Have to have white on bib, belly, and all 4