My Rhodesian Ridgeback was becoming very protective and a little aggressive, even to me once he got to about 18months. I had him castrated for about £150 and the change was massive within about four to five days, once the hormones had worn off. He calmed right down, was much calmer and returned to usual perfect temperament. They removed the testicles, which in my opinion made him look better, not that this had any bearing on my decision to have it done.
they usually leave a small portion of the scrotum when they stich it back up- apparently, if they remove the lot and stiched it up, theres a chance of the wound shrinking and not healing properly. He now has a very small scrotum which has shrunk over time and he still has his character, temperament and the personality i loved, before he started getting grumpy.
in my opinion, a total success, plus there zero chance of testicular cancer...