Income - targeted programs are the most effective at decreasing shelter admissions and should be the mainstay spay / neuter program of any animal welfare program that is serious about decreasing shelter deaths. (maddiesfund.org)
In many regions, they're killed immediately upon shelter admission, with no opportunity to find a new home. (onegreenplanet.org)
Recently the value of this practice has been recognized and formal programs implemented to more actively plan shelter admissions, most notably through «managed intake» programs. (millioncatchallenge.org)