Just as he was about to cut Mickey in half, he switched ideas, and instead, erased the last few minutes of his memories and sent them both back home, hoping they would think it was all a dream. I know it sounds far-fetched, but it's all to explain the Doc's appearance in Epic Mickey
, since if he was just a figment of Mickey's dream, he would not exist.
Hence why he abuses a chicken ("Dee chickee in dee baskee!") and a dog ("Dee doggee in dee potty!")
- Unlikely, Remember, this was 1933, and Disney's acquisition of  was in 2006.