The Maine Coon is a large and friendly cat, which is how it got its nickname, "the gentle giant." It is characterized by a big ruff along its chest, robust bone structure, rectangular body shape, an uneven two layered coat, and a long, bushy tail. The breed's colors vary widely, with only lilac and chocolate disallowed for pedigree. People often say the Maine Coon has "dog-like" characteristics. Professionals notice certain health problems recurring in the breed, including feline hypertrophic cardiomyopathy and hip dysplasia, but reputable breeders use modern screening methods to minimize the frequency of these problems.