Finally, the biggest problem is that the stray dogs multiply so quickly that the catcher cannot get them all, and the majority of strays is the offspring of homeless dogs. Dogs need only three months to have a baby. If a female stray does not neuter, she can breed almost thirty puppies a year. It means that there will be more and more homeless dogs in the street. The fertility of a dog is faster than a human’s so there are not enough families to adopt the homeless dogs. With the increase of the number of the stray dogs, the stray dog problems are becoming more and more difficult to control.