For routine situations, assume you're taking 10 on rolls. You can roll actively at any time if you want to, or if I ask for it.

You head into the forest, and the trees close in around you. Within only a minute, the castle has disappeared behind you and all you can see are the shadowed trees. There are no landmarks to sight on, and no sun to use as a guide. The forest is silent except for the sound of your footsteps.

Anyone who wants, make a Survival check. A separate one for Dog, too.