C++, array of pointers to objects

Hello experts, please have a look at the code below:

#include <iostream>
using namespace std;

class Dog{
public:
	int x;

};

int main(){
	Dog * matrix[12];
	int * matrixInt[12];

	*matrixInt[0] = 12; //works fine
	*matrix[0]->x = 12; //does not work

	return 0;
}

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How can I make it work?
Thank you

panJames