Whenever an animal is used for an advert or film it is supervised by an animal welfare expert to ensure the animals are treated properly and do not suffer any stress or anxiety. Even if the animal is getting tired they demand it takes a break or has a chance to sleep.
I know the advert doesnt look particularly good but I can assure you there are strict regulations that have to be followed whilst the animal is on set.

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Lifes roads are for journeys, not destinations!