Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "There is no contagion, (no) hamah (they used to say in the Jahiliyyah that an owl comes out of the head of the dead person and cries out, and does not rest until vengeance is taken), nor is there any reality to Safar; and flee from the leper as one flees from a lion," or he used the word "usud" (lions).
(b) Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) said: "A sick (animal) should not be brought to a healthy one." This hadith will come where we argue for annulling a marriage because of the five defects.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13772