The first black blister in a dog’s birth is the amniotic fluid sac. The amniotic fluid sac is a fluid environment that surrounds the fetus and protects it. Usually when a dog gives birth, the amniotic fluid sac will come out first. If the amniotic fluid sac comes out smoothly, the dog will generally give birth soon.
But if the amniotic fluid sac does not come out smoothly during the delivery process, it may cause the delivery time to be extended. , even requiring midwifery. Therefore, when a dog has difficulty in giving birth, it is necessary to seek medical treatment in time for midwifery or caesarean section.