@debradownsouth I'm referring to Shelters, not Rescue Groups. Local government shelters (according to the Animal Control Officers in my corner of the world) consider Petfinder to be an unreliable, often outdated, source. They recommend using PetHarbor.
Wikipedia, btw, does not guarantee accuracy on any subject. Furthermore, I would consider 14,000 (combined shelters and rescue groups) to be a drop in the bucket. The biggest problem with Petfinder as a resource would be that it's only as accurate as the person posting the information. Some things might be spot on, others... not.