Dean had been acting.. strange lately. Not just his usual self, but genuine strange. He had started scratching his head, constantly nuzzling, barking at the mail man, sniffing around and literally playing fetch...

Sam and you were obviously very confused about this.. till they realized he had been possessed by some kinda demon that was messing with him.

“Dean. I think you’ve become a dog.” Sam finally said as they were sitting by the table eating.

Dean was just scratching his head as he stared at them confused. “what?” He said confused.