Boy meets horse in the unsentimental ‘Lean on Pete’

There is painfully little love, except for the warm and compassionate filmmaking itself, in Andrew Haigh’s tender and heartbreaking coming-of-age drama “Lean on Pete.”In his first American film, Haigh, the British director of “45 Years” and “Weekend,” proves every bit as adept at burrowing into fragile human intimacies across a vast Western landscape as he showed in his earlier, more cloistered dramas.He makes precisely tuned, quiet movies that speak vol