A study from the Journal of the International Society for Anthrozoology says women who have a dog by their bedside tend to get a better night's sleep.
Researchers say women who share beds with dogs were less likely to be disturbed in their sleep and felt more secure and comfortable.
Dog owners also tend to go to sleep and wake up earlier than cat owners.
Women who sleep with cats said their sleep was disrupted as much as women who shared a bed with a human partner.
The connection between better sleep with dogs is based on self-reported data and has not been confirmed using an objective measure.