In American Western slang, a dogie is a calf (not a dog).
The 1937 film Git Along Little Dogies features the singing cowboy, Gene Autry. He and others sing a variety of classic western songs such as Red River Valley, She’ll Be Comin’ Round the Mountain, Oh! Susanna, and others. They even sing some of them as a medley with lyrics on the screen for the audience to sing along.
The movie’s title though, may leave some wondering exactly what a “dogie” is. The movie was named for a song of the same name, which existed as early as 1893. In the American West a dogie is slang for a stray or motherless calf. Nobody is exactly sure where the term came from but in the book Western Words, author Ramon Adams speculates that because small calves who are weened from their mothers too soon are unable to properly digest coarse grass, the resulting swelling of their bellies resembled a batch of sourdough starter in a sack. This became “dough-guts” and eventually just “dogies.”