The Doggie is a friendly pet you can acquire from the "Dog Owner" in the black market.
To get the dog you must pay 3 Honey and 100 gold coins.
Once owned he can be given many commands such as "Stay" and "Fetch".
He can also be renamed to anything you want.
The Doggie will not attack.
If you throw a stick for your Doggie, he will chase and retrieve it.