Boston Labs mature within a range of 20 to 50 pounds. They are considered to be medium-sized dogs. A Boston Lab is a mix between a Boston terrier and a Labrador retriever.

Boston Labs have short fur and come in a wide variety of colors. They are alert and cheerful. Most make excellent family pets and are good with children. The Boston Lab also possess characteristics of both Labradors and Boston Terriers. Labrador retrievers are large dogs bred for retrieving waterfowl. They are noted for their friendly, exuberant nature. They require a lot of exercise. Boston terriers are small, compact dogs descended from pit-fighting dogs. They are bred as companions and need only moderate exercise. As a result of this lineage, Boston Labs are known for their agility, obedience and intelligence. They have an average life expectancy of 10 to 15 years.