The story was published in 1968 abroad and in 1987 in the USSR.
Professor Preobrazhensky picked up stray dog Sharik on the street. Together with his assistant, doctor Bormental, he transplanted a human pituitary gland to a dog. As a result, Sharik transforms into a very rude man Polygraph Polygraphovich Sharikov.
This story about intervention in natural process lead to negative consequences.
The most I remember the moment when Polygraph Polygraphovich flooded the flat when he was hunting a cat.
This book taught me that you can’t interfere in other lives.