That looks like the spine and pelvis of a raccoon: [![raccoon][1]][1]. 

Although the raccoon is not native to Germany, they were introduced there in the 1930s and can be found in the wild. The map below shows raccoons killed or found dead 2001-2003. So while it's highly unlikely that you stumbled across the remains of a raccoon, it is possible. See [wikipedia][2] for more information about the raccoon in Germany. 
[![enter image description here][3]][3]


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Since the raccoon is quite uncommon in Europe, another possible solution would be the [European badger][4]. 

Check out the pelvis bone in the right-hand side of this picture:

[![Badger][5]][5]


  [1]: https://i.sstatic.net/LDPck.jpg
  [2]: https://en.wikipedia.org/wiki/Raccoon#Distribution_in_Germany
  [3]: https://i.sstatic.net/N9mql.png
  [4]: https://en.wikipedia.org/wiki/European_badger
  [5]: https://i.sstatic.net/D8tGt.jpg