@DormVella @MeuwChoo Your best bet for getting it working on current operating systems will be with Acid Trips installer. It's pretty much abandon ware at this point and Ubisoft don't seem to be doing anything with the Petz franchise at the moment :(
http://kutheraver.com/acidtrip/petzinstallers.html

I would definitly buy this in a heart beat as well. Please Please add this to steam. It was one of my favorites as a child.

I would buy this game in a heart beat, no questions asked. I also know other people who would buy this game in a heart beat. My discs are so old, scratched and don't work anymore. I would love to have Petz 5 on Steam. I know Steam would do a good job for porting this, and my wallet would be happy, because I'd be happy.

I have this on disk somewhere but it's such a pain to force it to work on current windows etc. I wish steam would port this I would 100% buy it!!! I grew up with Catz 2 and when Dogz/Catz 5 came out I would play it every day after school! 10/10!