Can seven people share in one sacrificial animal?

Yes, up to seven people may share in a single camel or cow for the الحج sacrifice (هدي). This is based on the hadith of Jabir: 'We slaughtered with the Messenger of Allah (صلى الله عليه وسلم) in the year of Hudaybiyah — a camel for seven and a cow for seven' (صحيح مسلم 1318). A sheep or goat can only be offered by one person. الشيخ ابن باز confirmed: 'A camel or cow suffices for seven الحجاج, but a sheep is for one only' (Fatawa ابن باز, vol. 16).