Load Screen Tutorial
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You can easily change the startup image to anything (file should be .BMP) you want using Resource Hacker to modify your main Petz exe. (make a backup first) Petza won't run on modified versions of Petz, so see this tutorial at the ratshack for instructions on how to use petza on a modified exe. (it's easy)
Here is the loading screen I made! If you don't feel like making one yourself, you can download mine. Simply overwrite the existing exe with the downloaded one. (make a backup first). Then follow ratshack's tutorial above to make it compatible with petza.