But let me say - maybe You can't see differents in dog's behaviour, but the organs are not ready to put them out!
Spaying is I think the most horrible thing which we can do for young organism..
We cannot see effects in behaviour and maybe we cannot see that at all, but the hormon's 'economy' (I don't know how to say it right
) will be broken! Maybe we'll see it now, or maybe for some years, but I guaranted You that Your dogs will have broken organism and (what's the effect) dog will be die earlier..
I suggest spaying after first rut. That'll be okay for the organism more than in 6months old..
Why do You want to spay that early - I gave You a question..?