Yikes...sounds like caution is in order. We live in the country, too, and see stray dogs from time to time. Seems that folks think it's OK to drop them somewhere, as long as it's out of the city limits. My sister is a dog trainer and judge for a local 4H unit and has 25 years experience raising and training dogs of all kinds. I'm going to pass on your question to her. She'll undoubtedly have some kind of advice.
"If you trust Google more than you trust your doctor than maybe it's time to switch doctors."