Above from L-to-R are Don Kay 'Little Brown Jug' Reynolds (as Little Beaver), Jim Bannon and sidekick Emmett Lynn in a scene from RIDE, RYDER, RIDE (Eagle Lion, 1949), the first of the four Bannon Red Ryder adventures.
There's more information and photos on Don Kay 'Little Brown Jug' Reynolds on the Old Corral. Go back to the Old Corral homepage, and scroll down the left side menu to the Saddle Pals-Sidekicks-Kids section, and go to the page with Reynolds ... or click HERE and that bio will open in a separate window / tab.
Although some of the data is incomplete or inaccurate, the Internet Movie Database (IMDb) has information on Don Kay 'Little Brown Jug' Reynolds: https://www.imdb.com/name/nm0721690/
There's more information and photos on Don Kay 'Little Brown Jug' Reynolds on the Old Corral. Go back to the Old Corral homepage, and scroll down the left side menu to the Saddle Pals-Sidekicks-Kids section, and go to the page with Reynolds ... or click 
Although some of the data is incomplete or inaccurate, the Internet Movie Database (IMDb) has information on Don Kay 'Little Brown Jug' Reynolds: