The statistics are staggering. Thousands of unwanted cats and dogs are put to death across the United States every year because they have no homes.
One un-spayed dog and her descendents can produce 67,000 puppies in 6 years!
One un-spayed cat and her descendents can produce 420,000 kittens in 7 years!!
Neutering males is as important as spaying females. One male can father many more puppies or kittens than any female can give birth to over a lifetime. Neutering reduces fighting and aggressive behavior and spraying. Spayed and neutered animals tend to live longer since the risk of many cancers and other disorders is prevented or reduced. Since neutering reduces the urge to "roam", many animals have a much longer lifespan because they are not running free, crossing streets and getting hit by cars, ingesting poisons, etc.
Animals have no emotional need to reproduce. They don't suffer emotionally from being neutered or spayed. Their personality does not depend on motherhood... or fatherhood. They don't get fat and lazy after being neutered or spayed if they get proper diet and exercise. The health risks of spaying and neutering far outweigh the slight risk involved with the surgery.
You may think that if your dog or cat has puppies or kittens you can find homes for them yourself but remember the large number of babies that can be involved. Until it's time to find homes, you need to care for them all. You need to help feed them, train them, pay for the food, veterinary care - including worming and shots - and supplies... And when it comes time to find homes... what if you can't? There are only so many homes to go around.
Think about this. It has been shown in animal welfare studies that more than 11 million animals a year are taken into animal shelters. Only about 4 million are adopted or returned to their home... That leaves 7 million animals left to be care for by only 6,400 shelters across the nation. There are approximately 5,500 animals born each hour in the United States. This is a massive over-population problem and spaying and neutering is essential in reducing the birth rate.