I bought 80 plant fat and it got rid of all my fat and 250 coins!!!!!!!!!

Do you mean daily pet food? 80 food units are not enough to feed 15 pets that you have, and all of them need not only plant fats but all other types of food as well according to their diet settings. Each pet eats 18 food units every day, or substracts 1 silver coin per food unit if you don't have enough food in your inventory. Your daily pet upkeep cost is 15 * 18 = 270 coins minus the food that you collect in explore or buy in trades.