Co-worker Wants To Unload Some Lab Pups On Me And Says They Are Pure. Same Litter Has Some Blue Heeler Pups Aswell. If Litter Is Mixed, Does That Mean The Genetics Is Mixed As Well?

He says the pups are yellow labs. They look yellow labs. But if there are siblings that are blue heeler, I do not want to breed the pups later on to find crossbreed litters.