Sayyiduna Imran bin Husayn (may Allah be pleased with him) said: I was with the Messenger of Allah (peace and blessings be upon him) on a journey when he (peace and blessings be upon him) heard a curse, and he said: "What is this?" The people said: A woman has cursed her she-camel. He (peace and blessings be upon him) said: "Take the load off it, for it has become cursed." So they took the load off it, and it was an ash-grey she-camel.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15541