What some religions say about sterilisation.
The MUIS Fatwa Committee states: "Fundamentally, all mazhabs (Schools of Islamic Jurisprudence) allow the sterilisation of animals. After analysing the arguments and position of the different mazhabs and medical opinion from the Society of Prevention of Cruelty Againts Animals (SPCA), the Fatwa committee decides that sterilising cats on the basis of 'maslahat' (general good) is harus (permissible)."
Sol Hanna, President of the Buddhist Society of Western Australia says: "There is nothing in Buddhism that indicates that sterilisation creates unwholesome kamma. While the female cats may experience some suffering after the operation, this is relatively mild, and is inconsequential next to the wholesome kamma of preventing the future suffering of cats that are without homes and being destroyed by the authorities. Plus there is good kamma in helping all the tom cats restrain their lust!"