If you're looking for the goldilocks of dogs – not too small but not too big – a medium-sized breed could be the answer ...

Welborn says there are no official guidelines for the weight classification of small, medium, or large dogs. However, one study suggests that toy dogs typically weigh less than 14 pounds ...

A 2021 study from the University of Helsinki found that small dogs were more likely to display aggressive behavior than medium or large breeds. Why? Fear and anxiety were major contributing factors.