What is the right age and method to neuter a male dog? Is it absolutely necessary to do so? If not neutered what are the complications?

Currently, most veterinarians in the US recommend that neutering be performed in dogs and cats at 6 to 9 months of age. The evidence is also mixed regarding the risks and benefits of neutering dogs before 5–6 months of age, and so no strong recommendation for or against the practice can be made. However, it is clear that neutering is justified for all dogs not intended for breeding. Neutering male dog is more likely to prevent or reduce behavioural problems like aggression, roaming or diseases like testicular cancer. Most vets follow conventional surgery to remove testicles.

Question by – Shivaprakash Gowda, Bengaluru, Karnataka