Welcome to the Pet Rescue Community
Do you need help with your game? Ask the Community for help.
After you've built the special building 'Hat shop' you will get cards (after completing a regular Level) with the option to put hats on your Pets.
You might also want to have a look at this thread: What does the Pet want? for more things to do with your Pets 😸
I finally ran out of Summer Petopia