zippityboomboom wrote:
Don't agree. If you have an issue, call animal welfare authorities. Stay with the vehicle until either the owner/authorities/both arrive to make sure the animal is okay. Taking something that is not yours is theft.
Ditto.

As a last resort I might get the dog out of the car, but I still would not leave with the dog until the owner and/or authorities arrived.  That note doesn't even leave a way to contact the person who took the dog.