Canadian Brand. Great Jack's Sweet Potato Dog Treats are made entirely of sweet potatoes with no added preservatives, antibiotics, hormones, artificial flavours or colours. These yummy treats are completely vegan and are ideal for dogs with sensitive stomachs. They're air-dried to lock in flavour and the chewy texture lets your pal satisfy his natural urge to chew. Paw-fect for dogs of all breeds, sizes, and ages!