I don't think it's appropriate for a 4 year old. It's PG, not G and the wild things are large and scary, plus the subject material is far too much for a child to grasp (IMO). I just don't think a little kid will "get it". There's a dark undercurrent at play here.
But for adults, at least for me an my wife, this movie was incredible. From the cinematography & detailed camera shots to the development of the characters and how it weaves a story that we all "get" but might have forgotten...
We believe that the Wild THings each represent one aspect of a child's emotions & world view:
- Carol: anger/destruction/violence [the id]
- KW: love/mother/safety/compassion [the super ego]
- Judith: sass/confrontation [the id]
- Alexander: shyness/being ignored
- Ira: complicity/compromise [the ego]
- Douglas: truth/honor [the ego]
- The Bull: sadness/despair/depression
- The Owls: All things associated with the world of adults
It's incredible.