Boris existed in earlier versions of the film before Tramp was introduced, as one of Lady's neighbors. Boastful and recently moved into the neighborhood, he viewed for Lady's affection along with a mutt named Homer. Eventually, the neighbor roles were given to the characters of Jock and Trusty and Boris was moved to elsewhere in the film.
He is a tall, slender, gray Borzoi(once known as the Russian wolfhound). He has a darker tone of gray in his ears, red eyes, black eyebrows and long eyelashes (even though he is male).
- It is unknown what happened to him and his friends at the end of the movie.
- Boris's breed is a Russian Wolf Hound.
- Boris was the only character to not appear in the remake.
- Boris is played by the late actor Alan Reed who did the voice of Fred Flintstone from The Flintstones the tv series.
- Boris has very sentimental words about love.
- Boris is a philosopher according to Peg, and is quite friendly and peaceful.
- He was a Russian character to have a Russian accent.
- Boris's gender is a male.
- Boris, Pedro, Toughy, Peg, Bull, and Dachsie were the only dogs in the dog pound.
- Boris is the name of a Japanese Rock Band.