Passing multiple enum types to the same function

EnumPassing.swift

import UIKit
import Foundation

protocol Animal {}
protocol EnumType {}

enum Dog: EnumType {
    case Direwolf
    case GrayWolf
    case Labrador
    case GoldenRetriever
}

enum Cat: EnumType {
    case Tabby
    case Tiger
    case Alley
}

extension Cat: Animal {}
extension Dog: Animal {}

let tab = Cat.Tabby
let dire = Dog.Direwolf

func doSomething(anim: Animal) {
    switch anim {
    case is Cat:
        print("I'm a cat")
        break
    case is Dog:
        print("I'm a dog")
        break
    default:
        break
    }
}

doSomething(tab)
doSomething(dire)