Compared to a juicy murder trial, a case of feuding neighbors isn't exactly Perry Mason's cup of tea. But Arthur Cartright insists that Mason is the only one who can muzzle the howling hound that's driving Cartright crazy. But Perry doesn't realize just how crazy until he meets his client's neighbor. Clinton Foley says Cartright is barking up the wrong tree with his canine companion - and swears that the man is dangerously insane to boot.

Mason's not the type to cop out on a client - but when Cartright draws up a will that leaves everything to his neighbor's wife, even Perry has to wonder if the man has slipped from anger into madness. That's why he pays a personal visit to Clinton Foley's house, where he finds one missing wife, one poisoned dog, and one corpse....