Is it supposed to be here? It was empty when I came and checked.Did the slime have dog parts in it? If so yeah, you're fucked.
Go back in the forest, the dog is in a semi hidden area to the right. If you find it, you'll have an interaction, then it'll go away again.
Go to the inn, rest for the night, the go to the top left of the forest, use a healing charm when prompted, then it'll join.
That said if there's already the red slime, it might be too late. Worth checking nevertheless.