Brindle Boar

• WWizards of the Coast2010-08-15
  Official Ruling
  If you sacrifice an attacking or blocking Brindle Boar during the declare blockers step, it won’t deal combat damage. If you wait until the combat damage step, but Brindle Boar is dealt lethal damage, it’ll be destroyed before you get a chance to sacrifice it.

Rulings via Scryfall