The Messenger of Allah said: "Cats do not invalidate the prayer, because they are one of the things that are useful in the house."
Sunan Ibn Majah Book 1, Hadith 103
← Previous Hadith "The Messenger of Allah and I used to perform ablution from a single vessel, when the cat had drunk from it beforehand."

Sunan Ibn Majah Book 1, Hadith 102 Next Hadith → "One of the wives of the Prophet took a bath from a large vessel, then the Prophet came and had a bath or ablution, and she said: 'O Messenger of Allah, I was sexually impure.' He said: 'Water does not become impure.'"

Sunan Ibn Majah Book 1, Hadith 104