TY JOUR TI Ophthalmic manifestations of herpes virus infection in dogs KW herpesvirus KW dogs KW herpetic corneal ulcer KW herpetic ulcerative keratitis KW dendritic corneal ulcers KW non-ulcerative keratitis KW forvet KW polyfferin A KW roncoleukin KW cycloferon JO Russian veterinary journal AU Oleynik, V.V. PY 2021 IS 2021 PB Publishing house "Logos Press"