Petz II will have adorable dogs scampering around your computer screen as you work.  The dogs play with each other, you can teach them tricks, you can feed them or give them a treat, and there are several different dogs you can adopt.

They'll appear from no where and surprise you with their antics, and this version also has a screen saver.

It's for Windows 95 + 98, and comes in the original box with the user guide.  The box has been opened, but everything is inside.

How fun is this!