The best time to spay or neuter a pet typically depends on the animal's breed, size, and overall health. For most dogs and cats, the ideal age is between six to nine months. However, some veterinarians suggest waiting until a pet is slightly older, especially for large breeds, to ensure optimal growth and development. Early spaying or neutering can prevent behavioral issues, reduce the risk of certain cancers, and help control the pet population. Always consult a veterinarian to determine the most appropriate timing for your pet's specific needs.