King dog is a term that is often used to describe the alpha or dominant dog in a pack or household. There are many synonyms that can be used for this term such as top dog, pack leader, alpha dog, head honcho, dominant pooch, ruler of the pack, supreme leader, and chief canine. These words all describe a dog that holds a higher rank or authority over others. It's important to note that while these terms may suggest an aggressive or commanding personality, a king dog can also be gentle and loving towards their pack. Whatever the synonym is used, they all refer to a respected and treasured member of the family.