Newborn piglet teeth clipping is practiced to prevent sow teat damage and sibling injuries. The welfare debate centres on whether clipping itself causes more harm than the injuries it prevents.
Piglet teeth clipping welfare requires individual assessment rather than routine treatment. Where litter competitiveness and teat damage are genuine problems, careful clipping with clean tools is preferable to allowing injury. But routine clipping of all litters without indication is unjustified.