Yesterday my husband and I were watching TV and Jasper was snoozing under the coffee table as per usual when all of the sudden he let out a few high pitched yelps. We rushed over and picked him up, checked his whole body over, looked in his ears, mouth, and moved all his joints. I made him get up and walk around a little and he moved okay besides being in a sleepy stupor. It was just so weird that he would start yelping from a sound sleep like that...do you think dogs can have nightmares? My other dog used to make little whimper sounds in his sleep sometimes but it was never an all-out yelping like Jasper did yesterday. Any thoughts?