Merged your Double Trouble and Invisible Wolf threads.
As to your invisible wolf, please confirm that you have named everything correctly. In the .nif, you cannot use more or less letters than the nif originally had. Therefore, like, for my African Crowned Crane, I had to use the name AfricanCrownedC in the .nif and for the main .dds file, because BirdSecretary has less letters. If your codename is shorter than the original name, then use underscores _ to fill in the gap. Example: BirdSecretary becomes Phorusrhacos_
Then you must make sure that in the main xml file, the new .dds name is reflected in there.