hi towtow
i hate to bring religion in this BUT
if you're a buddhist, you surely understanding the concept of not causing suffering to any sentient beings - by not neutering your pet due to either ignorance or arrogance you are surely directly involved in perpetuating suffering for your pets through your actions.
it is one thing to dabble in luck and nombor empat ekor but to equate superstitious to buddhism and to ascribe ignorance (of neutering) to buddhism that's not right.
besides reading up neutering/spaying, permit me to say you may need to brush up on your dharma lessons!