Python today's dog

import random
class Dog(object):
    _range = [1, 189]
    _base_url = 'http://www.robots.ox.ac.uk/~vgg/data/pets/data/images/{}_{}.jpg'
    dogs = ['shiba_inu','staffordshire_bull_terrier','shiba_inu','english_setter','great_pyrenees','leonberger','saint_bernard']
    @classmethod
    def today(cls):
        return cls._base_url.format(random.choice(cls.dogs), random.randint(*cls._range))

print Dog.today()

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