You know, there is advice given on the internet and still put forth and endorsed by all kinds of dog people that the way to create a dog that is safe around food, with kids and adults, is to mess early with their food. Put your hands in the bowl when they are eating. Take the food away, give the food back. And lots of times, maybe even most times, it can work. BUT, it can fail and when it does it can actually create a resource guarding dog where one might never have developed otherwise. I wonder if this might be the case with the first people who had Forest?
The advice I followed I got from my Mum, a farm girl, when I was a kid. Leave the dog alone when he is eating. Give him his food and let him eat in peace.