Intensively farmed pigs are among the most intelligent animals in commercial agriculture and among the most welfare-compromised by standard industrial practices.
Pig intelligence is well-established — they outperform dogs on many cognitive tests — making the welfare costs of intensive confinement proportionally greater. Sow stalls prevent virtually all movement for months. Tail docking without analgesia is practiced to prevent tail biting, itself a symptom of crowding and boredom rather than an inevitable pig behavior. Enrichment and space resolve the root cause; mutilation addresses the symptom.