I wouldn't be surprised if your beautiful Aussie is a "put out" dog, as we say around here. You know, the pet that wasn't what they thought it would be, so they bring it to the country and "put it out", just knowing that someone will take it and care for it and love it. I get so angry when a new pet shows up on my doorstep, lost, hungry, scared, confused. I hope I'm wrong about your pup, but Aussies can be a handful, and people buy them not knowing how "special" they are. Good luck finding the owner, and if you don't, enjoy your new partner. One word of advice from an ex- Aussie mom, buy a book about Aussies, it helped me.