Demon possessed dog?

We found a lost dog after we got back from the retreat. I say it was lost b/c it had a collar but no tag and was well groomed. It was obviously not a stray. It did smell though and was a bit...mmm, strange.

The dog wouldn't respond to our calls and was just wandering through the village as if it were lost and confused. I got some doggy treats and went to see if I could find a nametag or address on the collar, but found none. I picked the dog up and we put it in our office. Gave it a bed, water, and food. Then we tried to decide what to do about it.

There was something odd about this dog. It was drooling an aweful lot, but not foaming at the mouth. And it wouldn't sit still. It was continuously walking, even in the office. I would walk in circles. It finally laid down.

Then it happened. I was the only one on the office with the dog when it went into convulsions. It jumped out of a sound sleep and started running at full speed, in circles. It lost it's balance after slamming into my desk. Then it laid on its side, legs kicking at full speed, unable to control itself. Drool flowed, i mean flowed, out of its mouth. And then minutes later it was back to normal...well, not really. It did get up and looked around. But then it started to walk again. In really really tight circles. It's back legs just spun around as the dog kept turning around, as if to see what was behind it.

We called the humane society but they weren't open until the morning. We called a emergency vet hospital and they said we could bring it in but it was really expensive. We decided to wait until morning and take it to the humane society first thing. So I put the dog in my trailer. And it slept for awhile. Until another convulsion came. Same thing happened as before. Except then it stopped convulsing, instead of walking in circles, it paced back and forth in my trailer, all night long. The next morning I opened my trailer door and the dog jumped out and ran away.