15:13 - 2018/01/24
Cat hair on one’s body or clothes invalidates the prayer.
Question: 437: Does the existence of the hair of a cat on a person’s clothes cause his/her prayer to be invalid?
Answer: Yes, it invalidates the prayer.[1] If there is one cat hair or there are two or three hairs on a person's body or clothes, his prayer is in order but if there are more than that, his prayer becomes void, as an obligatory precaution.[2]
1. Ayatollah Seyyed Ali Khamenei, Practical Laws of Islam, Q437.
2. Ayatollah Seyyed Ali Sistani, Question & Answer, Animals.