Create a lively birthday card design. The central feature should be a playful Jack Russell terrier, who is in a cheerful mood, wearing a festive party hat, and is in a position ready to fetch a green tennis ball. The background should feature gentle rolling hills and a clear blue sky, symbolizing an idyllic countryside scene. Dot the hills with subtle hints of wildflowers of various colors and add an old-fashioned wooden fence to further enhance the rustic feel. This design should emanate a theme of outdoor festivities, joy and excitement.

Generated with these themes: Tennis, Jack Russell terrier, and Countryside.

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