There are several health benefits to neutering. One of the most important concerns the prostate gland, which under the influence of testosterone will gradually enlarge over the course of the dogs life. With age, it is likely to become uncomfortable, possibly being large enough to interfere with defecation. The prostate under the influence of testosterone is also predisposed to infection which is almost impossible to clear up without neutering. Neutering causes the prostate to shrink into insignificance thus preventing both prostatitis as well as the uncomfortable benign hyperplasia (enlargement) that occurs with aging. The only behaviour changes that are observed after neutering relate to behaviours influenced by male hormones. Playfulness, friendliness, and socialisation with humans are not changed. The behaviours that change are far less desirable. The interest in roaming is eliminated in 90% of neutered dogs. Aggressive behaviour against other male dogs is eliminated in 60% of neutered dogs. Urine marking is eliminated in 50% of neutered male dogs. Inappropriate mounting is eliminated in 70% of neutered dogs. Activity level and appetite do not change with neutering. However, if your pet tends to put on extra weight, then you can reduce the diet intake and increase the exercise level.
Question by - Mayank Verma, Ahemdabad