The kids and were playing outside this evening and my 1.5 year old dog treed a squirrel out behind the house. I went and got my rifle but it had hidden by the time I got back. It was nearly dark and was back in some thick pine trees. He stayed there barking...

What's the best way to train a dog for treeing squirrels? He obviously has interest and I'm excited to get him out this weekend.
Do not be slothful- for yesterday and tomorrow are thieves of today.