The initial confusion, for you info, comes from the fact that the book is really a translation of the original French diet with a few additions. In the original version of the book, pork was not allowed in any shape or form. In France, there is a "fat free ham" (I use the word "ham" very lightly here) which is however allowed on the Dukan diet. It's not very nice and bears no resemblance to the highly flavoured, usually highly salted varieties available in the UK.
I'd advise caution. Fine while you're losing well, but as you near your target, if you struggle, switch to chicken and prepare it yourself!