There may be several reasons why dogs sleep holding slippers: 1. Sense of security: Dogs may feel safe holding slippers because they regard slippers as belonging to their owners, and holding slippers is like holding their owners. Same. 2. Sense of smell: Dogs have a very keen sense of smell and they like to smell their owners’ scent. Slippers usually have the owner's scent, so holding the slippers allows dogs to feel the owner's presence. 3. Chewing: Some dogs like to chew slippers or other items to relieve oral discomfort or consume energy. Holding the slippers allows them to continue chewing while sleeping.
In short, dogs sleeping with slippers is a very cute behavior, they may like it for some reason If it does not affect their health and safety, you can let them continue this habit.