Spaying or neutering pets is typically recommended before they reach sexual maturity, around 6 to 9 months of age. However, the exact timing can vary based on factors like breed, size, and overall health. Early spaying or neutering can help prevent certain health issues, such as unwanted litters and some cancers. For large breed dogs, it might be advisable to wait until they are closer to 12 months to reduce the risk of joint disorders. Always consult with your veterinarian to determine the best timing for your specific pet.