Why is a custom texture not showing in oblivion? (Elder Scrolls)?

I took a dive into editing textures using nifskope, and GIMP. When i applied the new colors into gimp and saved as a different name of the original DDS. file, i then went into nifskope and changed the color of an animal with my texture. It shows up just fine in the nifskope window, but when i try to put it in the game it doesnt show any part of the animal. If anyone knew why this happened id be greatly appreciated. Thnx in advance