While in erlin this year, I ate at several Doner Kebab places and had mixed results. Back in the 80s in Germany when the Kebab shops became popular you were able to get Lamb kebab. Nowadays the lamb meat is "too expensive" as one of the shop owners stated and nobody wants to buy it. Most of them now sell either chicken or beef (which I think is more like mixed meat) kebabs.
It's amazing how many Doner Kebab shops there are in Berlin.
Happy eating.
JBa