Grown Szarik was played by two dogs: Spik and Atak (in dangerous scenes). Atak played although part of Szarik's mother Mura in first episode.
Throughout the whole series, Gustlik uses the specific local dialect, accent and pronunciation from the Upper Silesian Industrial Region; however, as he mentioned several times, he actually hails from the Cieszyn Silesia - an entirely different part of Silesia, with very different local dialect.
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We asked Doctors Jo Wilson, April Kepner, and Andrew DeLuca to tell us the episodes of the show that they think are the most essential to understanding their characters.