Here are some quotes to prove I know what I'm talking about.

Quotes about "guard dog" Labradors:

"Generally speaking, Labs are happy, friendly souls, but they are very easily bored. Labs have above average intelligence and learn quickly. Labrador Retrievers make great family members, usually get along well with children and other pets. They will alert you to strangers, but are not "guard dogs", although they will offer protection to the best of their ability. Above all, they give unconditional love. Your Labrador Retriever deserves love and respect from their family."
-Labrador Retriever Rescue, INC.

"True Labrador Retriever temperament is as much a hallmark of the breed as the "otter" tail. The ideal disposition is one of a kindly, outgoing, tractable nature; eager to please and non-aggressive towards man or animal. The Labrador has much that appeals to people; his gentle ways, intelligence and adaptability make him an ideal dog. Aggressiveness towards humans or other animals, or any evidence of shyness in an adult should be severely penalized."
- The AKC Labrador Retriever Club, from breed standard

"Their best feature is their temperament. Labs are loving, people oriented dogs. They are happiest when they are with you. Labs are retrievers and will bring you things they find laying about your house or yard. They tend to be quite patient with children and wonderful family dogs. They are not guard dogs. They may bark protectively, but will generally not act more aggressively. Labs are wonderful people dogs, more likely to lick someone to death than hurt them. They tend to be stable, not easily upset by strange things or occurrences. They will take many things in stride."
-Just Labradors, labrador retriever FAQ's

"A sweet, gentle, and playful temperment is really what a labrador is all about, if that is lost, then the breed is lost, because that wonderful labrador temperment is what attracts the majority of people to this breed."
-Windfall Labrador Retrievers

Quotes about training Labradors:

"The Labrador Retriever is an intelligent dog that is not difficult to train because it learns quickly and likes to work for its handler. It is such a great pitty if such a dog can do nothing more than be a pet."
-Enclyopedia of Dogs: Labrador Retriever- page 202-203

"Labrador Retrievers are people- and action- oriented dogs, and can become bored if left to their own devices. Untrained, they can be unmanageable due to their size and enthusiasm. Unexercised, they will often turn to destruction or escape to alleviate boredom and excess energy. They require attention and love as much as food and water. Labradors are easy to train which makes obedience work a fun way to interact with your dog. Labradors also require plenty of exercise -- this is especially true since most Labs love to eat! Ensuring they get proper exercise, training, and attention will give you a happy, healthy Labrador."
-The AKC Labrador Retriever Club, INC

Mixed quote about both topics:

"The Labrador Retriever is a loving, affectionate, lovable, patient dog. Highly intelligent, loyal, willing, and high-spirited. Lively and good-natured, they love to play, especially in water - for they love to swim. They have an excellent, reliable, temperament and are friendly, superb with children and equable with other dogs. They crave human attention and need to feel as though they are part of the family. Labs are easily trained. Some may be reserved with strangers unless very well socialized as puppies. These dogs are watchdogs, not guard dogs, although some have been known to guard."
-Labrador Retriever (Black) (Chocolate) (Yellow)
{What an odd website name!!!}