Entered into Canine Cynology in 1980, 44 years ago. His career started with exhibiting and breeding Old English Sheepdogs under prefix Apsala and his B.I.S. dogs won many National and International title in FCI shows.
Since 1989 he was organizer and Chairman of more than 100 International and National all breed shows in Slovenia and different European countries. He earned the reputation of the remarkable progress of dog shows in Slovenia and also the fact that Slovenia has been for the first time organizer of European FCI DOG SHOW in 2010.
For its work he has been awarded by Slovenian, Hungarian, Slovakian, Ukrainian and Bulgarian Kennel Clubs. For many years Denis has been treasure of Slovenian Kennel Club, member of board and President of Slovenian Kennel Club from 2004 to 2008. From 2009 till 2019 he was an active FCI all breed judge of Bulgarian Kennel Club – BFRK and organizer of many shows in different European countries. At 2012 he was an official FCI supervisor and delegate at European Dog Show in Leuweerden in Nederland, and European Dog Show in Bucharest in Romania 2013. Since 2020, when he returned to the Slovenian Kennel Club, he has been actively working on the revival of the Alpe Adria Winner International Dog Show of Portoroz, planned as an Circuit show; but today already recognized as ISTRA – Slovenian Summer Night shows on the Slovenian Adriatic coast, near Italian border.
Mr. Kuzelj Denis is an active international FCI judge since 1995 and has been invited and judged in nearly all FCI countries, Northern and South America, Australia, Africa and Asia, as well as taking part in several FCI Section Shows ( Europe, South America, Asia) and World Dog shows. Part of his experiences are certainly also definitely made up of frequent participation at the biggest and most important International shows like Amsterdam Winner, Baltic Winner, Bundesieger Dortmund, Championat du France, Dracula dog show in Romania, Eucanuba Long Beach, Eurasia in Moscow, Helsinki Winner, Kyiv Rus, Golden gate and Crystal Cup in Ukraine, Lisbon Winner, Punto obligatorio in Spain, Split Summer Night shows, St. Patrick show in Dublin, Philippines Circuit in Manila, White Nights – St Petersburg and many many more.
He is qualified to judge all breeds, but during his career he was invited to judged many speciality shows, most of them in FCI groups 1, 5 and 9.