WILLIAM MULLINS / SCIENCE PHOTO LIBRARY WILLIAM MULLINS / SCIENCE PHOTO LIBRARY
Labrador retrievers. Black labrador retriever, Canis familiaris, playing with a puppy. The domestic dog usually has a litter of between 3-10 puppies. These nurse for about six weeks, change their teeth after about three months, and become sexually mature after about ten months. Both male and female dogs take on a parental role during this time. Retrievers were originally bred to retrieve felled game birds from cold water and heavy vegetation. They also have a keen nose and a dense water-repellant coat that makes them ideal for this. It also has an obedient nature and so make an excellent guide dog or pet.
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