The 50kg dog was pushed out of the window by its drunken owner.
"The dog had a soft landing because it fell on a man," said police spokesman Grzegorz Wierzbicki.
The dog escaped with just a few scratches but the unidentified man was in a state of shock, police said.
The one-year-old dog, named Oskar, was placed in an animal shelter while police investigate its owners for animal abuse.