Photo: Hilary Bronwyn Gayle/SMPSP
Dog has two protagonists, one human and the other canine, and both were transformed by their time in the Army into shells of their previous selves, battle-scarred and jittery with PTSD, then discarded when they were no longer able to do the job for which they’d been trained. But the movie, which stars Channing Tatum and some very expressive Belgian Malinoises, never really gets around to holding the institution responsible for any of this. The military simply exists in Dog, an impassive fact, impervious to questions about its purpose or expectations that it do anything other than make more war. War is just another American product, like coal or corn, more essential for the industry it supports than as…