The Feline Fix, Rocky Mountain Alley Cat Alliance's low-cost, high-volume spay-and-neuter program, aims to make a significant dent in Denver's feral cat population by sterilizing thousands of unadoptable strays each year. But the program is also open to domestic tabbies who might otherwise be breeding all sorts of havoc; prices are much lower than what most vets charge for the service, and the Fix even offers occasional specials to help promote awareness of the overpopulation problem.