the ... hittites eat animals with cloven hooves, so we no longer eat cloven-hoofed animals, ... .

This is not quite correct. To be kosher a mammal has to both have cloven hooves and chew the cud -- i.e. they have to be a ruminant. Pigs are out because the don't have the dual process digestive track. Camels are out because the don't have cloven hooves.

More details in the Wiki article here.