What is the mechanism in which steroids can trigger pancreatitis? Would any dose be a trigger?

Table scraps of meat, even chicken with little fat can cause my dogs attack, weird happens only sometimes. Also glucosamine vitamin for dogs caused an attack and had to discontinue on one dog and other was fine with it, just a sensitive stomach, my dog loves food but unable to eat human food because never know when it’s going to cause an attack. She whines, stretches, sticks bottom up and hides under bed and closet and will be up all night whining when attacks happen.