Question

How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?

Answer 1

only and only one egg

Answer 2

Answer:

To give birth to six puppies, the number of eggs a female dog's ovary must have released is six.

Those six eggs were fertilised with the sperm of male dog and hence the formation of six zygotes took place.

Unlike human's reproductive cycle where a female is most fertile at fourteenth day, a dog is most fertile at the eleventh​ day.

So, if a female dog mates around that time of her estrus cycle the efficiency of pregnancy increases.