Anyone with a knowledge of dogs, a little extra time, and a willing heart could do this. The first thing you need to do is gather information. Better yet you could just jot down some things you want to talk to the kids about. Another idea would be to get together with friends and make your own educational video. The second thing you need to do is to find an audience.
Schools are always interested in having guest speakers.
Don't forget about girl and scouts. 4-H. church groups. and day care. You also need to keep in mind that the topics need to be age appropriate. From kindergarten to third grade. I usually talk about basic care, approaching a dog, and just the general tasks that dogs perform.