I think dog saliva and digestive juices are an entirely legal method of extending the chain.
So, here's my incredibly tenuous rationalization so I can add another link:
You mentioned dog saliva. If you have a big drooly dog like a St. Bernard or a Newfoundland, and they shake their head, the saliva goes flying everywhere. It would hit you if you were solid - but not if you were a ghost!
That's the tortured reasoning that lets me recommend Pam Jernigan's incredible (and Kerth-winning, deservedly so)
Tryst . What a wonderful ghost story and romance! Don't miss it.
