Tyler's Sis, there are a lot of good reasons to get a dog neutered besides humping. It's not a guarantee that neutering will stop the humping.
Here's some info:The Canine Behavior Series
Spay/Neuter Behavior Benefits
Why do we spay female dogs and neuter male dogs? Spay/neuter helps produce healthy and good-tempered purebred dogs. Spay/neuter allows a breeder to remove dogs from breeding who should not be bred because some of their puppies and the people who lived with those puppies would suffer. Spay/neuter puts a stop to passing on undesirable genetic traits, while allowing the pup or dog being "culled" from the breeding program to go on and have a great life.
Another significant reason is that spay/neutered dogs do not produce puppies who join the population of unwanted dogs. Spay/neuter is part of the solution to having to put massive numbers of dogs to sleep because there are not enough homes for all of them.
But what's in it for us? What's in it for the dog who is spay/neutered instead of being left intact? What's in it for the family who will live with that dog? After all, you could conceivably keep your intact dog from breeding-though you might be surprised at the difficulty that involves!
But let's say you could do that and didn't mind the inconvenience. Leaving breeding ability aside, why ELSE would you want your dog spay/neutered? Lots of really good reasons exist for doing this. Too often, people stop at the overpopulation reason and never get to the "good stuff" that will matter much more to the average dog and family. Let's talk about the good stuff.
A male dog who remains intact experiences a huge increase in testosterone in adolescence. At several months of age, the male's testosterone level can be several times that of an adult male! This gives a real jump start to hormone-related behaviors, including urine marking in your house, aggression toward other male dogs, territorial aggression, and escape-oriented behavior in order to roam.
Some male dogs, especially tiny terriers and hounds, may be impossible to housetrain if you wait too long to neuter them. With all dogs, be guided by your veterinarian's opinion as to the best time for spay/neuter. Six months to one year of age is usually about the right time.
For best behavioral results, it's best not to wait past a year of age to neuter males. Once a hormone-triggered behavior has continued long enough, you can be dealing with a firmly entrenched habit that will not fade even after neutering. Frequently, neutering helps with behavior problems, even if done much later, so don't give up on it just because you've missed the optimum time.
Intact male dogs tend to have more difficulty concentrating on tasks and to show erratic behavior in the vicinity of a female dog in heat. Intact males may not be able to eat or sleep when a female dog in heat is in the same house! Jumping fences to go after a female down the street is common, even in dogs who have never roamed before.
Your 1-year-old or 2-year-old intact male dog may be acting like a neutered male in terms of being easy to live with, but chances are that if you leave even an easy-going fellow intact to the age of 3 years, you'll see undesirable behaviors. The age of 3 is prime time for an intact male dog to be involved with a terrible tragedy, such as those dogs who have killed children. Obviously, not all intact male dogs are aggressive child-killers. But the risk is increased, and parents need to know this, as does everyone who has a large-breed male dog. If you don't have an important reason for breeding the dog, and the right facilities to keep the dog from harming anyone, why live with this increased risk?
If you want to take your dog out and about, whether for family outings, runs at the dog park, or pursuit of dog sports such as agility, the dog will function better if neutered. Dogs are much more the victims of their own instincts than humans, less able to override impulses.
An intact dog tends to expend a lot of attention and energy in the direction of reproduction. A spay/neutered dog retains the full character of its male or female identity, but has more attention and energy to devote to other things.
What things might a dog do instead of focusing on reproduction? Guide dogs are spay/neutered to help them focus on life aiding blind people. Other assistance dogs to people with disabilities are commonly spay/neutered, too, in part because it helps the dogs focus on work. Certain pups are set aside for breeding future guide dogs when they come from bloodlines of dogs who are serving well in the work and show themselves to be good prospects as they mature.
Since dogs produce litters rather than the single babies and occasional twins born to human, it's not necessary for a huge percentage of dogs to reproduce. Plenty of future dogs can come from the carefully selected dogs who live with people with time and talent to devote to responsible breeding. This is a high calling, and we're all indebted to those people who do it well. They are vital to the future of dogs. If this is what you want to do, find an expert breeder to mentor you, so that you'll be producing from the best of dogs.
Most dogs have careers as companions to humans. Through this labor of love, they enrich and even extend our lives. Spay/neuter makes it easier for us to responsibly care for dogs, and increases the enjoyable activities we and our dogs can do together.
So now you know the behavioral benefits of spay/neuter. When there is no good reason to keep a particular dog intact for breeding, spay/neuter is a great way for you and your dog to live happily ever after.