A Rat Dummy would basically be a armor stand with a mask of rat on it (You don't put the mask of rat on the stand on its crafted) and you could bind rats to it some way and it would act like its the rats owner ant they would bring items to it you could also give it a staff to make bound rats permanently do the staff's thing (break, Breed, Harvest/replant) and drop the things that they grab there for farms and such