I don't think it's easy to purchase; we've tried for years. But Bold Raw in Erin produces it for dogs. Aside from their own retail shop in Erin, the brand is available at numerous pet food shops in the GTA: http://www.boldraw.com/wheretobuy.html You might want to check with the store before going to make sure they carry the tripe.
Our dogs are fed raw and absolutely love the stuff; the stinkier, the better. For your mother's sake, buy it already packaged (in 1-lb containers) and frozen from Bold Raw so you don't have to stink up the whole house.
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