A black lab could be trained to do both waterfowl and big game/deer hunting. Just make sure you get a great dog and either put 200% into training or find a great trainer. Our past yellow lab who was put to sleep earlier this year due to cancer could out hunt any dog we ever met until the last couple months of her life when she got cancer. The two labs I've had were both great hunting dogs. We have a new black lab puppy that will hopefully become a prized hunting dog and field trial champ. Just spend the extra money and go for a dog with great genes. Another great way is to buy dogs that didn't make it as field trial dogs but are still amazing hunting dogs and will still beat most dogs, these dogs will usually be about 3 years old.