Red wolf 
Ring-tailed mongoose 
Ruddy Mongoose 
Sea otter 
Sechuran fox 
Serval 
Side-striped jackal 
Slender mongoose 
Sloth bear 
Small Asian mongoose 
Small Indian Civet 
Small-toothed Palm Civet 
Smooth-coated otter 
Snow leopard 
South American Coati 
South American gray fox 
South American Sea Lion 
South China tiger 
Southern African wildcat 
Southern river otter 
Spectacled bear 
Spotted Hyena 
Sri Lankan Jackal 
Sri Lankan Leopard