The Domestic Medium Hair designation is not actually a breed name but rather a descriptive classification for mixed-breed cats with medium-length coats. The term serves primarily as a convenient category for identifying cats in shelters, veterinary records, and casual conversation, distinguishing them from Domestic Shorthairs with short coats and Domestic Longhairs with long coats. This classification system helps people understand what to expect regarding grooming needs and appearance without implying specific breed ancestry.
The term Domestic Mediumhair appears in both one-word and two-word forms, with both being equally correct and understood. Some sources hyphenate it as Domestic Medium-Hair, though this is less common. The classification is purely practical, acknowledging that these cats exist in a middle range between short and long coat lengths. Unlike breed names that designate specific lineages and predictable characteristics, Domestic Medium Hair simply describes coat length in cats of mixed or unknown ancestry.
In British English and some other regions, mixed-breed cats are affectionately called moggies, a term encompassing all non-pedigreed cats regardless of coat length. This colloquial name carries no negative connotation and is used fondly by cat lovers. Some people use the terms mixed breed cat, random-bred cat, or alley cat, though the latter can carry unintended negative implications despite these cats' many positive qualities. Within veterinary and shelter contexts, the standardized Domestic Medium Hair classification provides clear, neutral terminology for record-keeping and communication.
The classification system using Domestic Shorthair, Medium Hair, and Longhair originated in North American animal shelters as a practical way to categorize cats without known pedigrees. This system acknowledges that most cats are not purebred and provides a simple framework for discussing coat length without making unfounded assumptions about ancestry. The widespread adoption of this terminology has made it standard in veterinary practices, adoption organizations, and casual conversation about cats.
Unlike purebred cats with registered names and official designations, Domestic Medium Hairs have no official registry, breed standards, or formal organization. They represent the majority of pet cats worldwide, existing as nature intended through random breeding and natural selection rather than controlled breeding programs. This lack of formal status in no way diminishes their value as beloved companions and family members.

