Quote from Conroe_Jr
if your talking about the Actual names of the files, its RenderRottwieler and Rottwieler.java
from the file i exported from Techne
So Rottwieler.java is the model file? (exported from Techne)
If so, then the line should be:
new RenderRottwieler(new Rottwieler(), 0.4F));
In the future i'd suggest conforming to what Notch has done and naming the model file as ModelAnimalNameHere.java Plus it keeps things organized and easier to find.