Dog Years Calculator: Convert Human Years to Dog Years in Python

One statement using variable 'dog_age' to calculate the age of the dog in dog years would be:

dog_years = 21 + ((dog_age - 2) * 4)

Here is a function with a valid docstring to calculate the age of a dog in dog years:

def calculate_dog_years(dog_age):
    '''
    Calculates the age of a dog in dog years.

    Parameters:
    dog_age (int): The age of the dog in human years.

    Returns:
    int: The age of the dog in dog years.
    '''
    dog_years = 21 + ((dog_age - 2) * 4)
    return dog_years