Herb B.

Yes, that was it! With yoast it works wonderfully. Thanks for your help!

Index links are now post titles:
Deutscher Sch?ferhund Steckbrief und Welpen Kaufberatung
Jack Russell Terrier Hund Steckbrief & Welpen Kaufberatung
Dachshund Hunderasse Steckbrief und Welpen Kaufberatung

but I need only the dog breed name as a link in the index page:
Deutscher Sch?ferhund
Jack Russell Terrier
Dachshund

(I want to keep the longer name in each post title, but not in the URL)