Create a simple 2D cartoon illustration of a pack of dogs sitting on a bench. Include a Pitbull, French Bulldog, German Shepherd, Dachshund, and Rottweiler. Each dog should have a unique, friendly expression, sitting together on the bench in a playful and relaxed manner. The background should be a vibrant playground with a water fountain, a few trees, and playground equipment like slides and swings, creating a cheerful and lively scene.