“Muzzle” (** out of four) was a muddled police procedural thriller about a street cop (Aaron Eckhart) and former veteran with PTSD whose canine police partner dies and he is paired with a new canine-partner but can’t let go of the other dog’s death and plunges into the seedy darkness of L.A. to find and apprehend those responsible. What starts out as an interesting and intriguing psychodrama loses its way, as film becomes meandering and pretentious and doesn’t lead to a satisfying conclusion. Eckhart is strong as always.