Generate an image capturing a charming cartoon scene. At the center, an adult Bullmastiff dog radiates serene joy. Its strong, lovable physical structure and fawn coat are artistically illustrated with soft curves to augment the overall cartoonish appeal. The dog's friendly brown eyes twinkle with excitement as it is seated amidst a festive birthday environment. The dog is seen wearing a comical colourful party hat. The backdrop is adorned with an overflow of pastel-hued balloons, along with streamers gently moving in the wind. Nearby, a grand bone-shaped birthday cake waits invitingly within the dog's reach, all prepared to be joyously consumed.

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