Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "A cat does not interrupt the prayer, for it is part of the household goods."
Al-Bazzar recorded it; its chain contains Abd al-Rahman bin Abi al-Zinad, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2314