
I am also usure weather to get my pup neutered. He's 7 month old Mastiff. However, I wouldn't consider getting him 'done' untill he has finished growing. So I will wait and see what his behaviour is like when he has matured (when he is 3 or 4) and will get him done if he has an 'eye for the ladies' :)
Getting them done will only solve agression and behavior problems related to sex-drive/testoterone levels.
I had my old boy done when he was 7 years old, we got him from a shelter when he was 4 yrs. He was very boistress, he would constantly bark at things while in the garden (birds, bees, planes, cats etc...) and he was always trying to escape. We noticed that this behavior would be at it's worst evrey now & then, & found out some of it co-incided with the neighbours bitch in season.
The thing that made us op for castrating was he managed to escape & with me running after him he got hit by a car. Despite the fact he was wrapped around the front axle & we had to jack the car up to get him out, he survived :) He had a burn on his side fron the exhaust, a large rip in the front of his shoulder (which required a drain to be fitted for a few weeks) a rip in the flesh over a knee cap, knocked a tooth out & scraped a small wart-type growth off his eyelid. He was very sore and it did take a couple of months for him to feel better :( But he was lucky it easily could have been a LOT worse.
After the castration his behavior slowly softened down. He lost the urge to escape and the frustration that came with wanting to look for bitches. It stopped some of the barking, but he never lost his boitstresness. In his case it was the best thing we could have done for him and I wish we had done it sooner, it changed him from a complete nightmare into a hanfull :)
On the other hand, the dog I had before that was never 'done', he never felt the urge to look for bitches and he never got a chance to 'sow his oats', even with an un-speyed bitch in the same house.
I doubt that castration will have any effect on your dogs behavior. He is only 8 months old, he still needs over a year to mentally & physically mature, and as testosterone is playing no part in the behavior he has now, removing that wont change him.
Vigilance is the key to him not sowing his oats :)