Boys sure are crazy and will do anything to get "it" won't they?!?!
I once found an intact male black lab and had to leave for a few hours, so I put him in our dog pen inside our fenced in yard. When we came back home a few hours later he was gone! Broke out of the dog pen (Which doesn't get used anyway... ) and jumped the fence!!
He came back two weeks later and had been neutered, he still had his stiches!!
I hope the chow boy finds his way back home, then to the vet!!