Hakeemul Ummah Hazrat Moulana Ashraf Ali Thaanwi Sahib رحمه الله has said that a baseless custom in which even well-learned persons are involved is to slaughter a goat or sheep for the attainment of shifa (cure) from sickness. If it is said that the purpose is Sadaqah, the response is: Then purchase meat or food and give it as Sadaqah to the poor. Why is this not done? The objective is in fact the act of slaughter which is baselessly believed to be a medium for shifa.
(SOURCE: MALFOOZAAT OF HAZRAT MOULANA ASHRAF ALI THAANWI SAHIB رحمه الله, PART 6)