Just remember that Labs, Goldens, Shepherds, and other very popular dogs have a LOT of health problems due to over-breeding. Hip displasia is very common, but there are a number of other ailments they are prone to. It can be very expensive, and heartbreaking to struggle with these problems. If you decide to shop for a purebred puppy, go to a quality small breeder, NOT a puppy mill or pet shop. Most get their puppies from puppy mills. Google that term and do a little reading- it's horrible. Be prepared to spend a significant chunk of cash for a quality dog of sound lineage. Mixed breeds tend to have a lot less of these problems (although their ultimate size, appearance, and temperment is a crap shoot as well) and as other have said, there are a lot of great dogs out there facing death unless someone comes along and gives them a forever home. We've had purebreds, and we've had mutts, and they were all great dogs in their own way.