         return "\(name) is a \(age) year old \(color) \(breed)."
     }
 
-    var dogYears: Int {
+    var humanYears: Int {
         
-        return age * Dog.dogYearsMultiplier
+        return age * Dog.humanYearsMultiplier
     }
     
     init(breed: String, color: String, age: Int, name: String) {

var fido: Dog? = Dog(breed: "Greyhound", color: "fawn", age: 6, name: "Fido")
print("\(fido!.description)")

print("\(fido!.name) is \(fido!.dogYears) in dog years.")

fido!.barking(loudness: Loudness.Soft)
fido!.eating(what: "dog food")


class Dog {
    
    static let humanYearsMultiplier = 7
    
    var breed: String
    var color: String
