class Dog:

    def __init__(self, name, sound, walking_speed, running_speed):
        self.name = name
        self.sound = sound
        self.walking_speed = walking_speed
        self.running_speed = running_speed

    def walk(self):
        print(self.name + " walks " + str(doge.walking_speed) + " km/h.")

    def run(self):
        print(self.name + " runs " + str(doge.running_speed) + " km/h.")

    def bark(self):
        print(self.sound*2 + "!")

    def print_name(self):
        print("Dog's name is " + self.name + ".")

    def sit(self):
        return("{} sat down.").format(self.name)

    def roll(self):
        print(self.name + " rolled over!")

    def hungry(self):
        print(self.name + " ordered kebab!")

doge = Dog("Nakki", "wuf", 5, 20)

print("Dog is called " + doge.name + ".")
print(doge.name + " says " + doge.sound + ".")
print("Normally " + doge.name + " walks " + str(doge.walking_speed) + "km/h.")
print("When chasing a cat " + doge.name + " runs " + str(doge.running_speed) + "km/h.")
print(doge.sit())

doge.walk()
doge.run()
doge.bark()
doge.print_name()
doge.roll()
doge.hungry()

doge.running_speed -= 10

print("After eating kebab " + doge.name + " runs only " + str(doge.running_speed) + "km/h.")