Cats are medium sized, green, red or white creatures, depending on where they live: forests, mountain or savannah.
Several intelligent races of Cats are known, most importantly the Leonin, the Nacatl and the Cat-People.
Leonin from Mirrodin
The Nacatl Leonin from Naya
Panther Warriors from Dominaria
The Leonin of Theros
The Rakshasa of Tarkir
Cats of Amonkhet