Reduce your wolves from four to three and you might have more success. I believe that was the only big change that was made on wolf breeding towers in the recent past. The video tutorial I followed and pulled all my information from was this:

https://youtu.be/6NUzfQc77-s

He also has one on how to tackle the recent changes to chicken breeding towers as well, though I am not anywhere near a point in the game where I can test it out myself.