In these amazing weeks, we see the puppies transform from deaf, blind, helpless loaves of fur, to real little puppies who can hear, toddle, and play. You’ll get to take a peek at the funny and touching moments when they realize there’s a whole world outside of themselves. The puppies’ eyes and ears are sealed shut when they’re born. Their eyes open first (usually at around 12-15 days old ), and their ear canals usually open around 7 days later. That period, between the time that their eyes and their ears open, is known as the “transitional” period. This is because useful vision and hearing are thought to be necessary for the puppies to enter into the next developmental period, which will be the socialization period.