Reason I am wondering about flashbacks ... my wife said the name of the other dog that was killed by the coyote. The other dog was his best friend. It was just part of a conversation, and my wife is completely deaf, so she has a particular way of pronouncing the other dog's name.
Then, my dog starts acting like he did when attacked by the coyote. Took a while to put all that together.
Maybe he really misses his best friend? The other dog belonged to my wife. It was how we became close - our dogs approved
background info: both dogs were together outside using the bathroom. A coyote came out of nowhere, and my dog was attacked, the other one defended him and was dragged off never to be found again. It was a very traumatic experience for everyone.