Neutering doesn't just help rectify behavioural problems like being aggressive and peeing to mark territories. It has immense health benefits. Testicular cancer is very comman among adult dogs usually older than 5 years. Neutering simply rules out even the possibility of this deadly cancer.
So many are other health benefits that I feel you must browse Internet as one can go on and on describing it's benefits. .Mind you it's written by a renowed dog wisperer.
Ayon- Neutering is recommended by vets as it doesn't just have behavioural benefits but also provides protection against cancer. And if you have a Labrador then neutering is A MUST. You can also speak to your Vet.
READ THIS ARTICLE WHICH WAS SHARED BY ONE OF US IN THE HIS FORUM WHICH WILL CLEAR ANY OTHER QUESTIONS PERTAINING TO THIS SUBJECT: http://www.cesarsway.com/tips/ basics/spay-and-neuter-myths