I loved Dr. Stanley's show too. I have heard, that about fearful neutered dogs. Makes sense. I have tried to expose my 16 month old intact boy, to as many dogs and people, that I can, to see, if he shows me, any reason, not to keep him intact. He's had 2 dogs, try to pick a fight, another, just bark, like a maniac in his face and several little dogs, growl and snap at him and they were all neutered males. Bodie just looks at them and moves on. He's happy, confident and nothing fazes him.
My last Golden, was neutered young and was submissive, to bullies, but never reacted in a fearful manner.
Lucy 222, have you looked at the results of the U of Davis Study? I looked mostly at the neuter side, because I have a male, but I think, some of the cancers went down for females, after their first heat and or waiting until maturity to spay. Males, there seemed to be no benefit to neutering, at all, aside from reproducing.