The Groenendael (in English, approximately ) is a variety of dog that is included in the Belgian Shepherd breed, but sometimes treated as a distinct breed. The Groenendael is recognized, either as a breed or a variety of the larger breed, by all major kennel clubs, such as the Kennel Club of the UK. In the American Kennel Club, it is called the Belgian Sheepdog, a term otherwise synonymous with Belgian Shepherd Dog more broadly. This breed is missing an optic chiasm, which surprisingly, shows no visual field deficits. It is identified by a specific eye movement that also occurs in people with a cut optic chiasm.
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