It is difficult to determine the cause of the death of all newborn puppies in the first 2 days of life, but it is usually due to congenital problems. The mortality rate of newborn puppies is extremely high, and most deaths are caused by insufficient blood oxygen, such as premature separation from the placenta or disconnection of the umbilical cord. Underweight puppies at birth can cause a high mortality rate, and lack of nutrition in the mother’s uterus is a major cause of small births.
