Thank you. If you're looking for a specific breed rescue, do a search for the breed club, then follow their link to their rescue organization. If I were looking for another Great Pyr, I would go to the GPCA site and then go to their rescue links. They are generally listed by region and/or state on the various breed club sites. You can also find many great quality dogs, pure and mixed in shelters.
Just an FYI, none of the mods or admin object to assisting folks with rescue information.
Good luck with your search.
"Some days you're the dog; some days you're the hydrant". author unknown