I did not think about ring worm. The dogs are NOT kept outside ALL the time. They live in a nice unfinished heated loft that doubles as the owner's office. The husband doesn't like dogs so they don't go into the residence itself.
The dogs just moved in and things are getting settled out. The dogs were staying at someone else's house prior to moving over to this house. They are well cared for and loved.
However, the owner did notice the issue prior to leaving and mentioned it. It was after she left that I discovered other issues. I don't think she realized the seriousness at the time and had done some additional care on her own.
I called a vet and he said to put some neosporin on the wound just in case. He said the shaking was not a good thing and to keep observing. I may talk to the husband this evening about taking the dog to a clinic.
My dogs are kept inside by the way. However, I don't judge other people that don't keep them in. That isn't my place.