If one leaves off the stoning, a sacrificial animal is due from him

Question: In the past Hajj, my wife stoned the first pillar, and I performed the stoning on her behalf for the rest out of fear of the crowd, but there was no crowd. Is her Hajj valid in this situation?

Answer: The Hajj is valid, and a sacrificial animal is due from her for leaving off the stoning. It is to be slaughtered in Makkah and distributed among the poor.
The obligatory sacrificial animal is one-seventh of a camel, or one-seventh of a cow, or a head of sheep that is acceptable for the 'Id sacrifice, namely a one-year-old sheep or a two-year-old goat.