Can splitter

For cat and dog food (and potentially for other applications), it would be good to be able to split a can in half leaving a rounded edge, such that the pet could eat directly from the can. The other half can then be fitted with a lid for later use. I'm sure it would be possible to devise a can-opener to achieve this.

The advantage of such a device is that it could be built into an auto-pet-feeder, which could be used to feed pets whilst the owner is on vacation.