Meet Samson, the adult Maine Coon cat who is nearly the size of a Bob Cat. He measures over 4 feet in length and could potentially be the largest domestic cat ever. Unfortunately, Stewie, the previous Guinness World Record holder for longest cat, passed away in 2013. Stewie measured an impressive 48.5 inches and was described as a robust and muscular Husky cat. So far, Samson's size makes him a strong contender for the title.