Yes, dogs do dream. Scientific evidence shows that dogs experience the same brain activity during REM (rapid eye movement) sleep as humans do, which is the sleep phase where most vivid dreaming occurs. Researchers have observed dogs twitching, moving their legs, whimpering, or barking in their sleep, which are signs that they are likely dreaming. Dogs likely dream about experiences from their day, similar to how humans dream about daily events. For example, a dog that enjoys chasing squirrels may dream about chasing them, and because dogs are very attached to their owners, they may also dream about their humans. Studies on other animals like rats, which have simpler brains than dogs, support the idea that animals replay parts of their daily activities in their dreams. In sum, dogs not only dream, but their dreams probably reflect their daily experiences and emotional attachments, including their relationships with their owners.