Here’s a very good reason to spay and neuter your pets. According to the Banfield State of Health report, spayed cats live an average of 3.1 years longer than un-spayed cats. That equates to a 40 % increase in the average feline lifespan. When it comes to dogs, there is now an FDA-approved injection to neuter eliminating the need for an operation. Ask your veterinarian about Zeuterin.