I moved to the SE Phoenix area last Spring and have been hunting gambels NW of Tucson, up toward Florence. I've been pleasantly surprised at the bird numbers I've seen, but also unpleasantly surprised how un-dog-friendly those cacti are! I took my lab out a couple of times to different areas, but within a 1/2 hour or so each time, he was done. He and I have hunted a lot in SE CO with a fair amount of cactus, but nothing compared to the teddy-bear cholla. Doesn't help that he hates it when temps are over 50, which they pretty much always are. So, my take is, the birds are there and not too hard to find (or flush, much to my surprise), but leave the dog at home. I've seen videos of GSPs, etc. hunting that same terrain very enthusiastically, most without booties, and I just don't see how they can do it! They must be a new hybrid with titanium skin or something...
As far as the snakes go - haven't seen a one.