"TouchbarPet" can not be opened because Apple can not look for malicious software in it.

[betaschaf]

[qaisjp]

this is a code signing issue.

you need to right click the app and click "Open". then you can get past this issue.

[dirkesquire]

This is not a big issue.

1. In system preferences, click on 'Security and Privacy'

2. In the bottom half of the screen you will see that OSX blocked the application. Give permission to open the app.

That's it!

[gardinermichael]

This is the third or fourth duplicate of this.