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One of the main reasons that there are so many unwanted dogs in dog pounds and rescues is because of overbreeding of dogs. The problem does not lie with dog breeders who are doing responsible breeding with their dogs. Since they sell puppies, they will only breed as many dogs as there is a market for so they do not end up with unwanted puppies.
Howeever, many people just get a free puppy from somewhere and then do not have that dog spayed or neutered, and then they may end up with a litter of puppies, which they then try to find homes for . Since these dogs are usually given away to other homes who only repeat the cycle, then we end up with unwanted dogs who are dumped when people move, and end up being put to sleep in some dog pound.
My thoughts are that if a person has a dog that is kept in their own home and yard, and not aloowed to have unwanted litters of puppies, there is no necessity of neutering unless the ownr prefers that.
Many neutered dogs lose their energy once they are no longer producing their natural hormones.
However, if you have a dog that runs around at will, and can contribute to the excess dog population, then it is best to have them neutered or spayed, and that will also often help the dog to stay at home better.
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