What is what dog breed is bolt?

Bolt is a fictional character in the animated movie "Bolt". He is portrayed as a white-furred, medium-sized dog with a distinctive lightning-bolt mark on his chest. While Bolt's breed is not specified in the movie, he appears to be a mix of several breeds, including American White Shepherd/ Swiss White Shepherd, Samoyed, and Siberian Husky due to his characteristic white fur and blue eyes. However, as a fictional character, Bolt does not belong to any specific dog breed recognized by commercial kennel clubs.