what is a persistent urachus
Email Article. The most common developmental abnormality of the puppy bladder is a persistent urachus. In the fetus, the urachus is a tube-like structure, which, by exiting through the umbilical (navel) area, connects the puppy's bladder to the placental tissues.This tube allows fetal urine to exit the fetus and be absorbed into the mother's system for elimination from her body.n the fetus, the urachus is a tube-like structure, which, by exiting through the umbilical (navel) area, connects the puppy's bladder to the placental tissues. This tube allows fetal urine to exit the fetus and be absorbed into the mother's system for elimination from her body.