The Gun dog reference article from the English Wikipedia on 24-Jul-2004
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Gun dog

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Gundog refers to breeds developed to assist hunters or sports people to retrieve prey. Generally, when we talk about prey, it is birds that gundogs retrieve.

Gundogs are broken down by type:

Several breeds have been used in different ways, so the line among different types is not always clear and different people might think of one breed as different types.