Coat on this dog looks like a broken jrts/prts, not what a Wire Haired Fox Terrier looks like............
But he also has brindle on him which is disqualification for a reg'd JRT/PRT.
The head doens't look like a fox or a jrt completely, FT have a narrow, long muzzle whereas this dog could be just a snippy looking jrtx dog.
FT conformation tends to be tall, very deep chested, very straight back, straight shoulders, very long neck and over angulated for the hind legs.
Tail is docked way to short for either breed.
To me he looks like a poorly bred jrt x.