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About the Labrador Retriever breed (Source Wikipedia.org)
The Labrador Retriever (also Labrador, Labby or Lab for short), is one of several kinds of retriever, a type of gun dog. The Labrador is considered the most popular breed of dog (by registered ownership) in the world, and is by a large margin the most popular breed by registration in the United States (since 1991)[1] the United Kingdom,[2] Poland, and several other countries.[3] It is also the most popular breed of assistance dog in the United States, Australia, and many other countries, as well as being widely used by police and other official bodies for their detection and working abilities.[4] They are exceptionally affable, gentle, intelligent, energetic and good natured,[3][4][5] making them both excellent companions and working dogs. Although somewhat boisterous if untrained, Labrador Retrievers respond well to praise and positive attention, and are considerably "food and fun" oriented. These dogs are as well loyal and great with little children. They may be used in shows. With training, the Lab is one of the most dependable, obedient and multi-talented breeds in the world.[4][3][6]

There are three recognised colours for Labs:[7] black (a solid black colour), yellow (anything from light cream to gold to "fox-red"), and chocolate (medium to dark brown). There is no such thing as a silver Labrador or a Golden Labrador, a common mistake for the Yellow variant. There is also a black-and-tan coat type, but this coat colour is the least popular as it renders the Labrador un-showable except in the UK.

Puppies of all colours can potentially occur in the same litter. Colour is determined primarily by two genes. The first gene (the B locus) determines the density of the coat's pigment granules: dense granules result in a black coat, sparse ones give a chocolate coat. The second (E) locus determines whether the pigment is produced at all. A dog with the recessive e allele will produce little pigment and will be yellow regardless of its genotype at the B locus.[10] Variations in numerous other genes control the subtler details of the coat's colouration, which in yellow Labs varies from white to light gold to a fox red. Chocolate and black Labs' noses will match the coat colour. Visit Wikipedia.org: Labrador Retriever for more info.

Golden Retriever

Chesapeake Bay Retriever