Questions about pigs
Traders and builders rulebook:


  The pig counts only if he owns the field. For ownership of the field, only the farmers are counted.


The PDF from Rio Grande Games for the princess and dragon does say that the magic portal can be used by a follower and the PDF from Rio Grande Games for Traders &amp; Builders does call the pig a follower in the rules.

However checking with the Complete Annotated Rules that cites a lot of sources:


  The original rules say: ’12 new
  followers in 6 colours (one builder
  and one pig for each player)’. In the
  Big Box rules, the builder and pig are
  no longer considered to be followers,
  which has a large number of
  consequences for their use. The RGG
  edition of the Big Box also changes
  this rule.


I've always played the portal as Meeple (big and small), Mayor and Wagon are free to be deployed but nothing else which is in line with the above statement.