When you choose the share option in the Petzi Social App for iOS and then choose how you want to share it "Email," "Messenger," "Twitter" or any other method, the Petzi App exits.
This is a known bug in the current release.
If you want to share a picture from your Petzi Treat Cam, tap on "Save for later" when you snap the picture. That will add it to your Camera Roll, you can share it from there.
NOTE: "Share" works on Android.