Why isn't printing?

[SpookyStuff]

class Dog:
    def __init__(self, breed, age, color, is_mixed):
        self.breed = breed
        self.age = age
        self.color = color
        self.is_mixed = is_mixed

dog1 = Dog("Border Collie", 3, "white", True)
dog2 = Dog("Golden Retriever", 0.5, "brown", False)
dog3 = Dog("Poodle", 5, "black", True)

print(dog2.breed)
#iisn't printing