Create a lively image exhibiting a birthday celebration with two adult Australian Shepherd dogs as the main characters. The first dog showcases a unique Merle coat, spotted with shades of gray and black while the latter is mainly white with Merle patches. Their captivating brown eyes reflect utter happiness. They are seated in a setting filled with animated birthday adornments such as bright balloons, a cake smeared with sprinkles and bearing candles set for a blow-out, and gifts wrapped in fanciful paper.

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