Sacrificing a sheep which has a blemish in its udder

Q: What is the ruling on sacrificing a sheep which has no blemishes except its obstructed udder? Is it permissible to offer it as Ud-hiyah (sacrificial animal offered by non-pilgrims) or not?

A: If this obstruction resulted from old age or an illness, then it is inadequate. Otherwise, it is sufficient. May Allah grant us success. May Peace and Blessings of Allah be upon our Prophet Muhammad, his family and his Companions!