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There are several reasons this misconception cropped up. An article from the American Kennel Club shed some light on these issues. One of them is due to owners sharing pork they’ve prepared for themselves. Pork that’s been seasoned with spices and sauces can be harmful to dogs. So, too, can a pork bone that’s been exposed to these spices. Those wanting to safely feed their dog pork shouldn’t share what’s on their own plate with their pet.
Raw pork can also present a danger to pets, as it can cause trichinosis, an infection resulting from the parasite trichinella spiralis larvae. As pork is rich in fat, there’s the possibility of its leading to indigestion or inflammation of the pancreas. Also dangerous for the canine pancreas are processed meats made with pork—think bacon, sausage, ham—and contain carcinogens linked to cancer. The high salt content of these forms of pork can lead to bloat, which is deadly for dogs. Additionally, among food allergies most often suffered by pups are those to rabbits, lamb, and yes, pork.
With all the above taken into consideration, another article from the American Kennel Club, while not disputing the cautions above, put forth this information: Pork is a highly digestible animal protein and an excellent source of amino acids.