Illustrate a whimsical birthday celebration scene with a slender adult Greyhound dog as the main subject. The dog's sleek fawn coat shines brightly against the vibrant background filled with balloons and streamers. Give it soulful brown eyes and place a miniature party hat humorously on top of its head. The celebratory setting is soothing with pastel colors and the smooth lines of the cartoon-style decoration.

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