Some questions regarding classes

[Truman]

Here we go again:

# Parent class
class Dog:

    # Class attribute
    species = 'mammal'

    # Initializer / Instance attributes
    def __init__(self, name, age):
        self.name = name
        self.age = age
	
    # instance method
    def description(self):
        return "{} is {} years old".format(self.name, self.age)

    # instance method
    def speak(self, sound):
        return "{} says {}".format(self.name, sound)

# Child class (inherits from Dog class)
class RussellTerrier(Dog):
    def run(self, speed):
        return "{} runs {}".format(self.name, speed)

# Child class (inherits from Dog class)
class Bulldog(Dog):
    def run(self, speed):
        return "{} runs {}".format(self.name, speed)
		
# Parent class
class Pets:
	
	dogs = []
	
	def __init__(self, dogs):
		self.dogs = dogs

my_dogs = [
    Bulldog("Tom", 6),
	RussellTerrier("Fletcher", 7),
	Dog("Larry", 9)
]

# Instantiate the Pets class
my_pets = Pets(my_dogs)

print(f'I have {len(my_pets.dogs)} dogs.')
for dog in my_pets.dogs:
	print(f'{dog.name} is {dog.age}')
print(f'And they\'re all {dog.species}s, of course.')

print(Pets.dogs)
print(my_pets.dogs)

I just complicated without a reason, basically without dogs list I can't print Pets class and my_pets instance.