How to Kill Your Neighbor's Dog (2000)

Shy, chain-smoking, insomniac Peter McGowan is an L.A. playwright with a string of hits that preceded his current ten years of failed productions. His mother-in-law is sinking into senility, a stranger is meandering the neighborhood claiming to be him, neighbors have a new dog that barks all night; his wife wants to have a child, and he does not: he's become impotent. He's working on a new play when a single mom moves in next door with her 8-year-old daughter... (imdb)