A recent study examined the practice of sharing a bedroom or bed with a dog. While the authors suggest that more research is needed, they compared sleeping with a dog to the practice of sharing a bed or bedroom with a child.
The current concern about co-sleeping with a child focuses on the child suffering from poor health, impaired functioning, developing problematic behavior and sexual dysfunction. However, there is not enough evidence to determine if there are negative effects of co-sleeping with dogs or other pets.
According to the study, the benefit of co-sleeping with both pets and children are saving resources, keeping warm, and feeling safe. It is a practice that has been going on for many years.
When it comes to sharing a bedroom with a dog, as an animal behavior consultant, I recommend letting a puppy sleep in a crate in the bedroom to help the puppy bond with the family and feel safer in a new environment. After the dog is trained and under control, it can be allowed to sleep on the bed with a family member. However, if the dog is not trained it can become possessive of the bed or other furniture to the point of becoming aggressive if a family member wants to move the dog. Whether it is good or not depends on many factors, including the dog’s temperament and the owners ability to train and control the dog.