http://www.instructables.com/id/Internet-Enabled-Raspberry-Pi-Pet-Feeder/
this sucks (Not recommended for dogs over 50 pounds > 23 kg)
http://www.petnet.io/
https://www.youtube.com/watch?v=qIFSuc9BW8E
http://familytechzone.com/2016/02/petnet-ios-automatic-pet-feeder/