It is desirable to slaughter camels in a standing position with their left legs tied as in the following ahadith:
1. Muslim reported from Ziyad bin Jubair that Ibn ‘Umar came upon a man who was slaughtering a camel while it was sitting. He said to the man, “Let it stand up, and tie its legs. This is the sunnah of your Prophet (peace be upon him).”
2. Abu Daw’ud reported from Jabir that the Prophet (peace be upon him) and his companions used to slaughter their sacrificial camels with their left legs tied and standing on three legs.”
3. Hakim reported from Ibn ‘Abbas concerning the Qur’anic verse (22.36) “then pronounce the name of Allah over them as they line up (for sacrifice)” he interpreted it to mean “as they line up and stand on three legs.” As for cows and sheep it is preferable to slaughter them in a lying position. According to some it is disliked to slaughter an animal standing that is to be slaughtered lying down and vice-versa. Others disagree and hold it is not disliked. It is preferable to slaughter one’ s animal with one’ s own hands, if possible, otherwise one may assign someone else to do it on one’s behalf, but one must be present there.