I own an adopted pointer that somehow ended up in a shelter in Korea that I just about couldn't be happier with, but I don't foresee ever going to a shelter to look for a dog. Due to the dog's prolonged stay at that shelter on an Air Force base, I was able to acquire a great deal of info on my adoptee before she came to me. I had no idea whether she'd ever point a bird -- the fact that she's pointed hundreds over the last 5 years is just a major bonus. She even got some extensive ink in the Pointing Dog Journal one time -- in fact, that message board is where I discovered that she even existed.
The acquisition of a bird dog is a lifetime commitment for me -- it won't end until one of us dies. That being the case, under ordinary circumstances, I'm going to take as many variables out of the equation as possible, and a big part of that is hard evidence of the dog's ancestors as field performers. I rolled the dice a little with the one I have and I came up a big winner, but it was a special situation and I doubt I'd get that lucky again. I'd try it if it seemed that the stars had lined up perfectly again, but I can't count on that happening.
My local shelter does a great job for our community and I always contribute to its fund-raisers and donate supplies when I can. But, barring extraordinary circumstances, it's not going to be the source of my field companions.
For those of you who go that route, God bless you, and may you and the dog have as much luck as me and my girl Kota have.
Here are a couple of "before and after" photos I like to show people. The first was taken when she was still at the Korean shelter and the second was about 2 years later.