Well, we've taken our pyrs to the groomer before and it was all stripped out when we picked them up, but I'm not sure how comfortable it was for them.
It kind of worried me at the time. I know that there are former groomers on BPO so maybe someone can tell us how the groomers do it and if it's rough on the dog or not.
I strip out nearly all of their undercoat myself using the mat rake with the double row of teeth. It usually takes a few weeks before it's all gone though when I do it. Also, I've found that some pyrs (depending upon bloodlines) strip out fully and some don't so I think that you'll find out with Cirra over time. Her breeder would know what to expect for her, I'm sure. Also, of course it depends upon weather. We traveled with our troup in April and it was so hot there that our dogs blew out all of their coat early this year (and it was like a snowstorm for a while here with 2 pyrs and a golden). I love Cirra, she's beautiful!