Here's why:
* Reproduction in dogs: A female dog only releases one egg (or sometimes a few) during her heat cycle. When she mates with a male, the sperm fertilizes the egg, and the process of pregnancy begins.
* One litter, one father: This means that one litter of puppies will always have one father, even if the female dog mates with multiple males during her heat cycle. The first male to successfully fertilize the egg is the father.
* Multiple matings: While a female dog might mate with multiple males during her heat cycle, it doesn't mean she will have puppies from all of them.
It's important to remember that breeding dogs is a complex process with ethical considerations. If you are considering breeding your dog, consult with a veterinarian and a reputable breeder.