I used to volunteer at the receiving desk at our Humane Society. One thing I have learned is that everyone sees dogs differently! LOL! We always encourage anyone who has lost a dog to check the shelter or have someone who knows their dog come down at least every other day.
Just tell them that there is a dog at the shelter that might be their Chow/GSD mix, but only they would know for sure. Give them the shelter address and even the dog's ID number at the shelter if you know it. I think they would be tremendously grateful for the heads up!!! If they are not, you tried your best and certainly have my respect and admiration for trying.
I don't know about the crimped hair, but with mixes I think anything goes!
GOOD LUCK! Reuniting a dog with its guardian is one of the best feelings ever!