Class with pointers to other classes as member data.

I am writing a game where a certain location will point to a creature which resides there and also the creature points to the location where it is located. I am running into problems however because when I declare the location class and add as one of its members a pointer to an as of yet undeclared class creature it gives me an error. Is there any way to make this work? I've rewritten the relevant code and posted it here.

So the problem basically is that I'm trying to create a pointer to a class that doesn't exist yet.
Anyone have any ideas?

Code:

#include <iostream>
#include <string>
#include <cstdlib>

using namespace std;

class location
{
public:
int x;
int y;
creature *pCreature; // CLASS CREATURE IS AS OF YET UNDECLARED! //
}newLocation;

class creature
{
public:
int health;
int strength;
location *pLocation;
}dog;


int main()
{
dog.pLocation = &newLocation;
newLocation.pCreature = &dog;

system("PAUSE");
return 0;
}

Gives the error message:

Code:

12 C:\Dev-Cpp\newTemp.cpp ISO C++ forbids declaration of `creature' with no type
12 C:\Dev-Cpp\newTemp.cpp expected `;' before '*' token

Forward declarations.

Thank you!