Doggy

A dog, usually a pet dog, often used when speaking to or about a dog in an affectionate or playful way.

From Old English 'docga,' originally a specific type of dog used for hunting but later became a general term for dogs. The diminutive form 'doggy' adds '-y' to create an affectionate, informal variation. The original 'docga' has unclear origins but may relate to size or purpose.