What breed of horse did not originate in Germany?

The Merens breed of horse is native to the Pyrenees region of France, specifically in the Ariège department. This breed is known for its distinct black coat and its history as a versatile working horse, particularly in the mountainous areas of France. As such, the Merens does not have any ties to Germany, setting it apart from the other breeds listed in the question.

In contrast, the Haflinger, Hanoverian, and Oldenburg breeds do have German origins. The Haflinger is a breed that originated in Austria but is heavily associated with the German equestrian culture due to its popularity and use within German-speaking countries. The Hanoverian breed is well-known for its development in the Hanover region of Germany, primarily as a sport horse. Similarly, the Oldenburg breed hails from the Oldenburg region of Germany, and it has been recognized for its qualities in performance disciplines.

Thus, the Merens stands out as the only breed in the options that does not have its roots in Germany.