WILLIAM MULLINS / SCIENCE PHOTO LIBRARY WILLIAM MULLINS / SCIENCE PHOTO LIBRARY
Dog wearing lifejacket. This is a Golden Retriever breed of the domestic dog (Canis familiaris). It is a good swimmer and is easily trained. It is a popular breed of pet dog, being particularly good with children. It originated in the UK, probably as a cross between several other breeds. It has an excellent sense of smell, and is often used to detect drugs, as well as being trained as a guide dog for the blind.
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