A free program for Android, by arrowshapes.

If you love the idea of a screen lock that allows you to choose your own unique pattern to unlock your phone, then this is the app for you. The idea is simple: create a pattern screen lock that allows you to choose from various themes, including a wolf theme. If you like the app, you can download it for free and install it on your phone. The app’s in-app purchase allows you to enable or disable the default lock. You can also get a variety of different themes to choose from, including a wolf theme.