guard hair
US /ˈɡɑːrd her/
UK /ˈɡɑːrd her/

1.
poil de garde, poil de couverture
the longer, coarser, and usually stiffer hairs that form the outer protective layer of a mammal's fur, covering the softer undercoat
:
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The wolf's thick guard hairs protect it from the harsh winter weather.
Les épais poils de garde du loup le protègent des rigueurs de l'hiver.
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The dog's coat consists of a soft undercoat and stiff guard hairs.
Le pelage du chien se compose d'un sous-poil doux et de poils de garde rigides.