When you first arrive at the shelter, find the kennel containing the dog you are interested in and stop in front of it. Stand about 5 feet back and casually observe. Does your first impression, your "gut" feeling, say Jindo to you? This is often the most important test of if you are looking at a Jindo or not. Run through the checklist of characteristics below if the dog appears to be a Jindo.
If the dog comes with registration paperwork, either UKC, Korean, or that put out by a US Jindo organization, then most likely the dog is a Jindo unless there is something obvious about it that suggests it's not. As yet, we have never run across a dog with papers. Papers from any of the other US organizations should be disregarded.