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Canines pack Dallas Zoo as first-ever Dog Day proves tail-wagging hit

The Dallas Zoo celebrates its first-ever Dog Day as nearly 200 dogs and their owners explore the grounds, with officials saying the pups were curious and engaged while watching penguins, lions and elephants.

The Dallas Zoo marks its inaugural Dog Day with nearly 200 canine visitors and their owners roaming the grounds, as officials say the pups appeared curious and engaged while observing penguins, lions and elephants behind glass.