The pig is unclean to you because its hoof is divided (the hoof is completely split in two ¹ ), even though it does not chew the cud. ² 

You may eat any among the animals that has a divided hoof (the hooves are completely split in two ¹ ) and that also chews the cud. ² 

“‘All ¹  animals that divide the hoof but it is not completely split in two ²  and do not chew the cud ³  are unclean to you; anyone who touches them becomes unclean. ⁴