The behaviour of pigs with undocked tails housed in either a straw-bedded system or a partially slatted system enriched with a commercial device. The pigs had been introduced to different enrichment treatments either before or after weaning. Following mixing at 10 weeks of age, behavioural observations were conducted every two weeks. The pigs were mainly observed for harmful social behaviour and enrichment use. Straw bedding prevented tail biting from occurring in pigs with undocked tails. Pigs in the partially slatted housing were at higher risk for tail biting. Introducing enrichments early in life and adding a simple enrichment device to an otherwise barren environment were not sufficient enough to prevent tail biting. The author suggest that functional design of environmental enrichment is required if tail biting is to be prevented.