TY JOUR TI Reduced tear production in three canine endocrinopathies KW keratoconjunctivitis sicca KW tear production KW Schirmer tear tests KW dogs KW diabetes mellitus KW hypothyroidism KW hyperadrenocorticism JO Russian veterinary journal AU Williams, D.. AU Pierce, V.. AU Mellor, P.. AU Heath, M.. PY 2021 IS 2021 PB Publishing house "Logos Press"