Fixing transparency issues on 356 GIF dog pictures (115x95px)

We have transparency issues on dozens of small GIF dog pictures (115x95px) of our dog game Dogzer, see some examples in the attached screenshot. We want to raise the quality of our game by fixing these issues ---> we have created a ZIP file with 356 of these pictures that have such problems. All these files need be reworked in order to fix these issues. Attached you can find some of these pictures ([login to view URL]). Once awarded the project, I'll send you the 356 pictures, they are very similar (same size, etc).