Retriever isn't one breed but a type of gun dog, built to find shot birds and carry them back undamaged. In Houston listings, the label usually means a Labrador or Golden Retriever mix, or a dog with that look and unknown ancestry. Most are medium to large, roughly 50 to 80 pounds, with a water-resistant double coat that sheds steadily.
Many are sociable, food-motivated and eager to work with people, and they love carrying things around. Expect a bouncy adolescence and a need for daily exercise and training. In Houston, that also means planning around long summers, since a thick coat doesn't cool easily. Because ancestry varies, a retriever mix may be calmer, bigger or more driven than the label suggests, so judge the dog in front of you.