为什么此虚拟析构函数在C ++中不起作用？

我正在尝试删除子类的对象。尽管我使用了虚拟析构函数，但仍收到错误消息：

malloc: *** error for object 0x7ffee08bab50: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6

我的代码是：

#include <iostream>

using namespace std;

class Animal{
  protected:
    int age;
  public:
    Animal(){
      age = 0;
      cout << "ctor Animal" << endl;
    }
    virtual ~Animal(){
      cout << "dtor Animal" << endl;
    }
};

class Mammal : public Animal{
  public:
    Mammal(){
      age = 0;
      cout << "ctor Mammal" << endl;
    }
    ~Mammal(){
    cout << "dtor Mammal" << endl;
    }
};

int main(){
  Mammal *dog = new Mammal();
  delete &dog;
}

如果有人帮助我，我将非常感激！