Just like people, dogs have different stages of sleep: short wave sleep (SWS) and rapid eye movement (REM). REM is considered to be the “sleep of body,” when the body is relaxed but the mind is very active. Dogs dream during REM.  SWS is known as the “sleep of the mind,” when brain activities have decreased, but muscle tone is still present.  It would be somewhat difficult to wake up your dog during the REM sleep stage, but he would probably wake up more easily during SWS. Dogs tend to start dreaming about 20 minutes after they fall asleep. Rapid eye movement is one of the most obvious signs that your dog is dreaming. If you look closely enough, you may be able to see your dog’s eyes moving under his eyelids. This movement is due to your dog actually seeing his dream images as if they were happening in real life. Your dog’s eyes may be fully or partially closed when he is dreaming. Quite naturally, dogs dream about typical dog activities (e.g., running,digging a hole and fighting with an imaginary burglar). His body movements when he is dreaming will likely reflect what is happening in his dream. For example, if he is running and/or chasing after something in his dream, you’ll probably see all of his legs moving in a running motion.  Your dog’s movements will likely be gentle and intermittent when he is dreaming, even if he is ‘running.’ Your dog may also have occasional muscle twitches during his dream. These twitches will look jerky and will not last long. He will quickly fall back into a more relaxed state.  Even though your dog may move occasionally while he is dreaming, his overall body posture will suggest that he is relaxed and at peace. Your dog may begin to make various noises when he is dreaming. For example, he may bark, whine, or cry, depending on what he is dreaming about. Usually, these vocalizations will be brief and infrequent, and will not wake him from his dream.  Your dog may also breathe differently during a dream. For example, he may start to breathe rapidly or have brief periods when he holds his breath.  Your dog’s breath may also become shallow.
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