How can I get more slot for my pet treasure?

If you go to the pets treasure page it gives you the option to buy slots. :) One slot is 50k sP.

If you are unsure where to go it's Personal-Pets-(Find the pet and click the little arrow in the top right where the stats are)-Treasure

Thanks 😊.

you can also use for 1-3 extra treasure slots (random number!) you can get these from the bath house among other places!

I love how helpful everyone is here. I've been around for quite some time and am still learning