The book "The Secret of the Dragon Stone" by Artavazd Egiazaryan

"Vakhang's 13th birthday started off disastrously: a fight at school, a stupid situation, Astghik, the girl of his dreams, not even looking at him, and his parents are constantly busy... Instead, on that very day, Vakhang had to accidentally help an ancient, not-so-mythical creature come to life, which he would first be afraid of, and then befriend. But dragons, as it turns out later, are not very friendly towards people..."