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The female dog, when she ovulates, releases a number of eggs as opposed to the single egg that a human female will typically produce. Even though each egg will only receive one sperm, the different eggs are not discriminating as to whose sperm that is. For example, perhaps a female dog in heat was impregnated by one male dog and about 80% of her eggs were fertilized. Now, let's say she has an encounter with a different male dog whose sperm fertilize the remaining eggs. Now you've got a litter of puppies with different daddies!

Say your female dog only had three puppies in her litter. Litter sizes will vary every time. This could be due to how many eggs she released, or how many sperm were successful in fertilizing the eggs. The womb is a hostile place to sperm and they do not actually survive very long inside it. If you suspect your litter of having more than one father, I'd be willing to bet it's a pretty big litter also, considering she has a better chance of a higher percentage of her eggs getting fertilized that way.

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17y ago

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