Customer after speaking with my boss (vet), I decided to be totally sure on what I told you. So, I did some research of my own. I consulted my old veterinary text books and internet resources. Some of those resources have confilicting opinions as you see here, but I do have a few sites for you to visit. I picked out the small highlights in each of them. But it may be beneficial to you to read them. Thanks again.
*According to Dogs Obedience Training. com...
American research has shown that there is a 70% improvement in behavior after castration.
* According to Veterinary Partner.com...
Spay/neuter helps produce healthy and good-tempered purebred dogs. An in tact male will have hormone-related behaviors, including urine marking in your house, aggression toward other male dogs, territorial aggression, and escape-oriented behavior in order to roam. A female with estrus, may show erratic behavior, signs of pain that may be similar to cramping in humans, and a greatly increased propensity to get out of the house or fenced yard. Spaying the dog prior to ever getting pregnant can spare both her health and her temperament from sometimes dramatic deterioration.
*According to Peninsula Humane Society & SPCA Resorce LibraryFACT: The only changes in behavior you'll see are positive ones. Male cats tend to reduce their territorial spraying depending upon the age they are neutered. If neutered young enough, before they begin spraying, they may never develop the behavior. Neutered male cats and dogs fight less, resulting in fewer battle scars, contagious diseases and abscesses. And since they aren't interested in pursuing females in heat, they also wander less, greatly reducing their chances of being hit by a car or getting lost.
*According to InfoVets.com
Behavior problems are generally reduced, including roaming, interdog aggression, and anxiety or fear-related problems.
*According to Cuhumane.com
Reduces or eliminates intermale fighting, irritable aggression of females in heat, and dominance aggression. *Neutering does not affect guarding behavior.
*According to Angelfire.com
Some undesirable behaviors may also be avoided or improved by spaying and neutering. There is quite a lot of individual variation in this, because other factors (training, socialization and so on) are at work here. Neutered males are less likely to roam off in search of female companionship, less likely to fight with other dogs.
*According to Program For Companion Animals Behavior, School of Veterinary Medicine......
One study showed that male intact cats exhibited less affection to humans than neutered cats.
There are plenty others. Let me know if this is not what you are looking for and I will see what I can do. Thanks again.