How to Create a reference to an External Print object Right now I have an object:

class Dog
{
  public:
    Dog(uint8_t I2c, Stream&amp; feedback);
    void Speak();
  private:
    uint8_t _I2c;
    Stream&amp; _output;
};

Dog::Dog(uint8_t I2c, Stream&amp; feedback):_output(feedback),_I2c(I2c){}

Dog::Speak(){
_output.println("Hi There.");
}


That is currently constructed in my sketch via:

Dog Dug([I2cPort], Serial);

How can I modify my class so that to be compatible with taking either a Serial object or an LCD display (using Adafruit's RGB LCD library )? 

Eg: 

Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();
Dog Dug([I2cPort], Serial);
Dog Sam([I2cPort], lcd);


Additional info:

The LCD in question is mostly used as a UI display in its own library this library refreshes the display every 1.5 sec. As information from speak(); and the UI have similar priority, it is acceptable if one instantly overwrites the other.

I am open to solutions that involve modifying the construction of Dog the only requirement is that I need to be able to indicate print("[something]"); in the Dog.cpp

I'm interested in asking this question on the Arduino SE as I believe there are differences in how you would approach this if the problem was on a traditional computer.
If your class is only writing to the stream you probably want to have your class take a Print object instead of a Stream object.

The Adafruit library inherits from Print.