If Dylan slept in his dad's house the first night there, it seems like his scent would have been on the sofa and any bedding he used, on the TV remote or button, on the cereal box and bowl, and both saliva and scent from hands on the spoon. His scent should have been in the bathroom, on the water faucets, on any towels he used, on the fridge door handle and any other door handles for rooms he went in. If he went bareboot on the floor, his scent should be on the floor too. Couldn't the dogs pick up his scent in many places in the house and followed it outside and wherever it went from there? (Unless someone carried him outside.)
How many people knew that Dylan was visiting his dad and that he was there alone while is dad was running errands. Did his dad happen to mention that to anyone (who could have been a predator), telling the person about when he was going back to get Dylan? Hearing that information, a predator could have gone to the house and told Dylan that his dad had sent him to drive him to his friend's house because his dad was delayed coming back. If Dylan got bored and went outside to wander around a bit, could he have been shot by accident by a hunter who hid the body to avoid getting in trouble? Do people have and ride horses in that area? Could someone have offered to give him a lift by horseback to a friend's home that was only a few miles away, saying he was going that way anyway? Is Dylan's dad's house close to the road? Could someone have stopped in a car or truck and offered to drive him into town where his friends live?
Was it usual for Dylan's dad to keep the house locked or leave it unlocked? Did Dylan have a key to the house? Was the house unlocked when his dad came back and found Dylan missing? Does the area have any open wells or pits that Dylan might not have seen and could have fallen into? Did Dylan have a bicycle at his dad's house that was in working order? If so, was it still there? It seems unlikely that Dylan would have taken his fishing pole and walked all the way to the lake by himself to fish, and he would need some bait too, and a bucket to put any fish in that he caught, if he doesn't let them go again. And swimming alone wouldn't be a lot of fun either. How hot was it in that area that day? Was Dylan independent and did he like to go places by himself? Or did he usually go with one or more friends or an adult? Are there poisonous snakes in the area if he decided to take a hike alone?
I think all children and teens who go on a visit away from home without an adult escort should wear a working GPS device for safety. I believe you can buy ones that look like a wrist watch. I know a woman who has quite a bit of land and she has a GPS collar on her dog that lets her know where the dog is at any time. She can check on her computer or her smart phone to get its location. Why not do the same with our kids?
Its hard to understand how kids can just disappear from home, the neighborhood, their school, etc. and many never to be seen again. It makes me want a GPS chip put in every baby at birth! I sure hope that Dylan is still alive and that he will be found and brought home real soon. This must be a horrible nightmare for his family and all those who know him and care about him. Have helicopters or small airplanes been used in the search?