I've checked back about 20 pages and can't find the answer.

Just wondering how I expand my pet's treasure greater than 3 slots. Pressing "Order treasure chest" does nothing.

Thanks.

will give you 1-3 slots per use, from the Millionaire center. will give you more slots than that, but costs CSC, from the cash shop. EDIT;; also, random events can grant 1 new slot to your active pet, while zapping them at Zapper v1 and v2 will sometimes yeild free slots.

Thanks Viperface!