In honor of National Spay/Neuter Month, which begins today, Tree House Humane Society (1212 W. Carmen) is holding its annual Sex and the Kitty campaign. Now through 2/28, low-income guardians of cats and kittens can obtain free spay/neuter services for their pets; feral cats are also eligible for free surgeries. Only two free services per household are available, but spay/neuter services for each additional cat costs only $10, and $40 for all dogs 50 lbs. and under. To schedule an appointment, call 773-227-5535.