NEW YORK: Children aren't the only ones being lavished with expensive birthday parties. Pet owners are also marking their dog's special day with celebrations. Lexi, a year-old black and white dachshund, celebrated her birthday in a Manhattan apartment with multi-colored balloons. She munched on dog-friendly cakes made of peanut butter, yogurt and carob, sipped Prosecco and nibbled on miniature cocktail hot dogs with her 15 canine guests. “I've met so many people in the neighborhood, thanks to her,” said actress Robin Brenner, who said she wanted to do something special to celebrate the occasion. New York-based media buyer Jessica Winston, has held two birthday parties for her 3-year-old Bichon Frise, Ernie, including last year's “Bark Mitzvah.