Just to be clear: Most of us here DO spay and neuter our dogs. I'm not at all sure how I would train my two females to "control their impulses" when they are in heat.
But we don't spay or neuter in response to anything PETA might say about it.
I should have been clearer.
I was more referring to male behavioral issues. It bothers me when spay/neuter propaganda suggests it is impossible to keep a well behaved intact dog.
There are viable reasons to spay and neuter, I just don't believe behavior modification should be at the top of the list.