There is a link I found on spaying/neutering thats pretty eye-opening and relatively recent as well.
http://www.caninesports.com/SpayNeuter.html
Our dog is mainly a companion, and not going for show or agility, at least by me....
However he's just had a development spurt the past week or so. Finally started being more assertive with other dogs at the park, and willing to stand up for himself even to somewhat larger dogs than before when he was more avoidant.
Also learned humping at the dog park, and has been doing that quite a bit more, though he oftentimes does it from the side, which I assume is more dominance in practice. Seems to love the ladies, though the past couple of days he's been put in his place by several older females, so I'm waiting to see how he is at the dog park today.
Also just saw him lift his leg to pee the other day. Though he's still not got it quite right, as yesterday he was walking and went near a tree. Only missed it because he was 2' in front of the tree, but we're sure he'll figure it out.
I'm a bit torn on what to do though. While I know the easy out would be to get him neutered now, and -might- reduce some assertiveness thats popping out now, I also think its not the right thing too do as there seem to be so many physical growth related issues from the article, not too mention as yet undiscovered mental ones.
I'm going to try and hold off for 2 more months until he is 9 months. Not sure from the article, but its not clear if there is any distinction between larger/giant breeds and smaller. Though the Goldens mentioned are considered Medium, while Shelties are Small-Medium which often times mature faster, yes?
So hopefully 9 months vs 6 months will mean a significantly greater amount of maturity can occur, which seems fairer to him by far.