Intro. Sira's story is a testament to the amazing and unpredictable biology of her species, a journey where science surrenders to the mysteries of nature. It all started at her first obstetric appointment, where she proudly celebrated her first three-month-old puppy; However, two months later, the ultrasound screen revealed two more little siblings. The most fascinating thing happened weeks later: the first puppy stopped its growth in the fifth month, entering a state of biological stasis to wait for the new members to reach its size. This dance of life continued with the appearance of a third litter, adding five, and finally an explosion of life with an indefinite number of puppies that forced Sira to gestate for an additional fifteen months so that everyone would be on the same page. Now, with everyone finally growing in unison, he prepares for the final leg of this monumental journey.