To find fictional literature about petgirls just go to our story section and look up jan311. The 'Jane" series is superb. Especially Jane and Carol in the Great Slave Hunt. I have written a little bit about training slavegirls and ponygirls, and my hardest part is finding something for them to do while they are not being trained or worked. Fortunatly with fiction I can just skip a few hours or weeks, and pick up from there.

To do it for real would require you find something to do all the time, or the petgirl would get bored, or tired of not speaking for more than a couple of hours. A walk in the park or doggy run would probably be out, at least regularly. kennelbitch has a few good ideas for handling of a pet doggygirl. She admits she works in real life and only has a few hours a week to devote to pet play. Constant pet life does sound like a good idea though, and good clean fun....
Yours to Obey
Pttwyn