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An expert believes she has uncovered the [secret / secretive] of what dogs dream about. Dr Deirdre Barrett, a psychologist at Harvard Medical School, conducted research [onto / into] dog dreams and [conclusion / concluded] that, among [another / other] things, dogs dream about their owners. Dr Barrett said canine dreams were [comparable / comparatively] to those we have: "Humans dream about the same things they're [interesting / interested] in by day….There's no reason to think animals are [any / some] different. Since dogs are generally [extremely / extremity] attached to their human owners, it's likely your dog is dreaming of your face, your smell and of pleasing or annoying you." The psychologist [ever / even] advised pet owners to give their pets "happy daytime experiences" to make [sure / surely] they have nice dreams.

Dr Barrett stated that there is [no / known] way of knowing for [certainly / certain] what dogs see when they dream. Research isn't even close to disclosing [that / what] mystery with human dreams. Her [conclusions / concludes] are based on the fact that canines and other [annals / mammals] have a sleep cycle that is [similar / similarity] to the human cycle. This includes a period of activity called REM (Rapid Eye Movement), which is the part of the sleep cycle when [humans / humane] dream. She said: "That certainly makes it the best guess that other mammals are [dreamt / dreaming] too." Dr Barrett also explained the reason that dogs move their legs while they are asleep. She said they are probably acting [up / out] their dreams so their legs move in a running [motion / lotion] in their sleep.