Sahih Adab al-Mufrad

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that he said: I am amazed at dogs and goats. In one year, so many goats are slaughtered and so many are brought to Makkah for sacrifice (and goats are more numerous than dogs), even though a female dog gives birth to so many offspring. (It is Allah alone who has placed blessing in the goats.)