The short is public domain according to: Film Superlist: Motion Pictures in the U.S. Public Domain by Walter E. Hurst, via Looney Tunes in the Public Domain. Archived from the original on March 26, 2016. Retrieved on December 6, 2013.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.