(The capital P in Pets123 is important.)
After you have logged in, tap on the Menu icon:
Then, select Play:
Under SHARED, you will find your pup in the Suite he or she was assigned at check-in:
To serve your pup a healthy treat, tap the Bone icon. (In some phones, a message might display saying you do not have permission for this, but ignore the message.) To fling the treat, drag the bone that appears in the middle of the screen up from the bottom and release. The longer you drag, the farther the throw.