Channing Tatum and earnest story make for a very good Dog

Movies dealing with post-traumatic stress disorder, or PTSD, have a long history, going back at least to 1946’s Oscar-winning The Best Years of Our Lives. Some films address the symptoms of PTSD in subtle ways, and others are more overt about the aftereffects of war, including mental anguish, drug abuse, violence, and more. The new film Dog finds a nice middle ground, helped greatly by its unusual story. Channing Tatum plays Briggs, a former Army…