[Python] Why is my overridden method not being called in a Python inheritance chain? [closed]

I am learning Python OOP and got confused with method overriding in inheritance.

I have three classes: Animal, Dog, and BabyDog.
Dog overrides the sound() method from Animal, and I also try to override it again in BabyDog.
But when I call sound() using a BabyDog object, the method of Dog is executed instead of BabyDog.

Here is my code:

class Animal:
def sound(self):
return "Some generic sound"

class Dog(Animal):
def sound(self):
return "Woof!"

class BabyDog(Dog):
def sound():
return "Small woof!"

obj = BabyDog()
print(obj.sound())


But this prints:

Woof!


I expected:

Small woof!


I don’t understand:

1. 
   Why isn't the overridden method in BabyDog being used?
   
   
2. 
   Is this related to method signatures or the missing self parameter?
   
   
3. 
   What is the correct way to override methods in multi-level inheritance?
   

Can someone explain what I am doing wrong and how Python decides which overridden method to use?

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