The ingenious learning system from www.Bueffeln.Net for dog ownership. The following questionnaires can be learned with this app: • DVG companion dog test • Dog handler • Proof of expertise in the North Rhine State Dog Law • Proof of expertise in the Westphalia-Lippe State Dog Law If you want to keep a dog in North Rhine-Westphalia that is taller than 40 cm or weighs more than 20 kg, belongs to a certain breed or is considered dangerous, you must, among other requirements, have proof of comp