ok so i have my 2 year old chihuahua and my 4 mounth old mixed breed. and so of course i kind of can't help it but spoil my chihuhua more but i have noticed that he has been food agressive latley. which i don't understand? he always gets more and gets fed first and always gets the last peice but he still is always so angry at the other dog and no i do not plan on getting rid of one i want to fix this problem. and so while i am feeding them i keep them seaprate because no matter what he always starts...