this is the enlarged version for larger dog food. i see no problem spinning it out here but if you need to insert a plate over the front half of augger to make sure it comes out without bunging up due to (dogfood)hydrostatic pressure.

has end attachment for optical sensor / jam detector / reverse - optical sensor needs to be enlarged , and screw needs to be filed down on the corners.

the stepper coupler is really tight, it needs to be drilled out on the sides a bit more just set against the sides and spin the drill. prefit the 2 peices together before inserting into hopper and bolt in motor.

https://www.thingiverse.com/thing:22655 add sound sensor to bark for food. probably even possible to teach them songs by playing tones. or add limit switch and press button for food limited to certain amount

https://github.com/netpipe/Arduino-Projects/blob/master/feeder-stepper/feeder-stepper.ino