"Mandatory spay" refers to a requirement or rule that says it is necessary to sterilize or neuter certain animals, usually pets like dogs or cats. Full definition
This is language used frequently when a breed discriminatory mandatory spay neuter law is being discussed. (stopbsl.org)
My support of mandatory spay / neuter laws is strictly to affect the second group. (blogs.bestfriends.org)
Areas with mandatory spay - and - neuter laws have reported a significant reduction in the number of animals who are taken to their facilities and subsequently euthanized. (vetsandiego.com)