The phrase "wiry texture" refers to a specific type of texture that feels thin, strong, and slightly rough, like the texture of a thin wire. Full definition
A slightly wavy outer coat, often of wiry texture, is permissible. (akc.org)
As the dog matures, the coat will take on the proper wiry texture. (petwave.com)
Miniature Schnauzers, on the other hand, have double coats with a wiry texture that come in various combinations of black, white, and silver. (pawster.com)