Some of us more 'mature' members remember when we were younger the dire warnings of always always ALWAYS cook pork fully because of the risk of Trichinosis - Wikipedia, the free encyclopedia
Animals got infected by eating other animals, and pork feed used to contain animal remains. But to reduce and eliminate that risk, regulations for raising meat animals have changed, and animal remains are no longer allowed in pig feed, and so the risk of being infected by eating raw or undercooked pork is negligeable. Freezing will also kill trichonosis:
Pork & Trichinosis
I have been feeding raw pork to my dogs without any issues for the last few years. They do not have any issues with it being too rich. I was reading somewhere a while ago that of the commonly consumed meats (chicken, turkey, beef, pork), pork had the best nutritional profile.
So as everything else, decide for yourself what your comfort level for feeding pork is. I know for myself, I would not be comfortable feeding meat from wild scavenger animals, like bear and raccoon, for example (someone here posted once that they collected road-kill raccoon to feed their dog - well, we don't have raccoons here this far North, but still wouldn't do it). And people I know who go hunting give me the moose and deer carcasses they get, but I won't take bear remains, for example.
Overall, pork raised for human consumption in North America should be safe.