What does it mean if a dog barks in its sleep?

What does it mean if a dog barks in its sleep?

Running, Twitching, and Barking This includes rapid eye movement, otherwise known as REM sleep, during which dreaming occurs. Many dogs try to physically act out their dreamswhich often involves reliving memories of what they did that dayand this is the cause of sleep running, barking, and twitching.

Should I wake my dog up if he is barking in his sleep?

Barking during sleep is not a bad thing for your dog to do. There is no harm to your dog, and hopefully, he is dreaming more about chasing a cat than he is about being tracked down by other animals. You should not wake him up because you will not only disrupt his sleep cycle, but it could startle him.