Okay so some of these details might be wrong, but the thing i recall most is that the boy comes to..another dimension, possibly, and his dog gets attacked by a wolf or something. This ranger guy heals his dog. Meanwhile there is an evil lady trying to capture the boy for some purpose.
It was a really stupid looking kids film, probably a straight-to-cassette one. Color, liveaction..From the 80s or early 90s..