If you raise pigs you would know it can be hard to get into the pen to feed them. This is a feeder that sits inside the pen but has a tube to put the food in on the outside of the pen. If you read thru all the comments you can find the instructions to make it as this is a forum rather than a blog post. I saw one person talking about their dogs being hard to feed because they fuss when the food comes. This would be good for feeding them if they are kept together in a pen too. The info is on Backyard Chickens.
Livinzoo