The WF/PmWp-''fz'' rat is an inbred strain of hypotrichotic rat derive
d from a Wistar Furth colony, This strain, also known as the ''fuzzy r
at,'' has been used for dermal toxicity research; however, little is k
nown about its longevity and age-related physiologic and pathologic ch
anges, Presented are basic anatomic and physiologic parameters, collec
ted for each sex at five ages, including hematologic and clinical bioc
hemical profiles, organ and body weights, and a characterization of gr
oss and histopathologic findings.