doghair

From dog +‎ hair, by analogy with the thick hair on the back of a dog.

doghair (uncountable)

1. (forestry) Pine forest where the trees have grown extremely thin and close together.
   • 1983, United States. Bureau of Land Management. Platte River Resource Area, Forest ecology/plant identification trail‎^[1], page 7:

     Doghair stands result from too many pine trees regenerating following fire or clearcutting which opens the forest canopy.

   • 1990, Olympic National Forest (N.F.), Land and Resource(s) ...‎^[2], page 142:

     The acres of doghair will continue to decline, due to the experimental program.

   • 2001, I Hear the Train: Reflections, Inventions, Refractions‎^[3], →ISBN, page 55:

     In front of us was a stand of doghair pine, the kind of stunted, thin trees that grow close together like grass, each stem maybe three to six inches in diameter.