Hi, I also have Papillons who go Hyperglyciemic within 48 hours of having their innoculations, with my last boys jabs i managed a bit of advance damage control, I made sure he had cooked Chicken (Loads) before and after the jabs, I also made sure he had as much food as i could get into him, it seems they are also prone to "Sugar" drops just like Chihuahuas are, especialy if they have a really mad run round, the vets said small but often is always the idea for food and with pups high protien is good too, just my little say lol but i am glad you broached the subject well done
Kind regards
debra