The Siberian cat, largest cat breed known for its lush triple-layer coat and muscular build, is a large breed that originated in Russia. Siberians are well-adapted to colder climates, and their hearty nature is reflected in their robust physique. Males of the breed can weigh between 15 to 20 pounds, with a solid and substantial build. Despite their size, Siberians are characterized by their playful and affectionate demeanor.