If you don’t plan to breed your dog, it’s best to neuter it. If you want your dog to have children, you don’t need to neuter it, because if you don’t neuter your dog and don’t breed it, your dog will be more likely to get pyometra over time. The best time for Teddy to be sterilized is around 5 months old, which can avoid changes in the dog's personality and mood. Neutering can not only reduce the occurrence of diseases, but also extend the dog's lifespan.