doggy

The word 'doggy' is a straightforward English formation, combining the core noun 'dog' with the productive diminutive suffix '-y'. The root 'dog' itself has a mysterious etymology, appearing relatively late in Old English as 'docga', displacing the earlier common Germanic term 'hund'. The affectionate suffix '-y' (also '-ie'), of native Germanic origin, is widely used to create familiar, informal, or child-friendly terms, such as 'kitty', 'mommy', or 'sweetie'. Thus, 'doggy' follows a common English pattern, transforming the standard term for the animal into a more endearing or simplistic form, often used by or with children, which later extended humorously to refer to human feet.

Structure: dog (canine animal) + y (diminutive/affectionate suffix) - dog: From Middle English 'dogge', of uncertain origin, possibly from Old English 'docga'. Functions as the core noun root. - y: A diminutive suffix from Middle English '-y', '-i', from Old English '-ig', used to form affectionate or small versions of nouns.