I usually use this carrier when taking the babies to the vet (usually 4 days old) but Grace’s puppies are so big they were so hot crammed in there with all that body heat, poor babies. Vet checked them over and docked tails and removed dew claws. I cant stand to hear them cry so I leave and come back. He insist it doesn’t hurt them, he says they cry because they don’t like to be held so firmly. I choose to believe him :0