Retriever is a type rather than a single breed. On adoption listings it usually means a Labrador or Golden Retriever mix, or a dog with that look and unknown ancestry, though Chesapeake Bay, Flat-Coated, Curly-Coated and Nova Scotia Duck Tolling Retrievers belong to the same family. All were developed to find shot birds and carry them back gently, which explains the soft mouth and the love of carrying things.
Most are medium to large, sturdy and food-motivated, with a water-resistant coat that sheds a good deal. Many are sociable and eager to work with people, and a long, bouncy adolescence is common. In Fresno, that means pairing daily exercise with a cool indoor spot for dry summer afternoons and a routine for the brushing a shedding coat needs. Because ancestry varies, meeting the dog tells you more than the label.