YEHORCHENKOVA, S. V.; PAVLENKO, Y. M. HISTORICAL ASPECTS OF THE TRANSFORMATION OF THE SYSTEM OF EVALUATION OF DOGS’ WORKING QUALITIES UNDER THE NATIONAL PROGRAM "VIDSICH" (PROTECTIVE DOG). Bulletin of Sumy National Agrarian University. The series: Livestock, n. 1, p. 17-24, 20 Apr. 2023.