A mixed breed dog is just what it sounds like - a mix of one or more different types of breeds. For the most part, the history of a mixed breed dog’s ancestry is not known, but guesses can be made for the parent breeds based on the dog’s appearance. Tracing a mixed breed’s family tree back any farther than that is a difficult to impossible task.
A small-sized mixed breed dog weighs less than 20 pounds. Because dogs inherit characteristics from either or both parents, and in the case of a mixed breed dog the parents may be unknown, it is difficult to predict their temperament. Most small breed dogs tend to be gentle, kind and happy and incorporate into most households well, so it is probably fair to say that a small mixed breed dog will generally do the same.
Due in part to their “hybrid vigor,” mixed breed dogs tend to be less prone to as many genetic diseases as their full breed cousins, but they can still develop hereditary and congenital conditions, including knee problems such as patellar luxation, leg problems such as Legg-Calve-Perthes disease, liver issues such as portosystemic shunts, respiratory problems such as tracheal collapse and spine diseases such as intervertebral disc disease.
Thankfully, Petplan pet insurance covers all hereditary and chronic conditions as standard. Which means if your small mixed breed inherits a combination of trouble from his parents, you're covered.