The story
Unknown. Possibly an abbreviation of dough-guts, the pot bellied appearance of a malnourished calf. Possibly the transliteration of the slang word dobie/dobe/doby, pejoratively meaning inferior. Since dogie and dobie in reference to an orphaned calf both appeared in print around the same time (1880-1888), it is possible that dogie is the original and dobie is the transliteration.
First known use, by meaning
- from 19th c. A motherless calf in a range herd of cattle; a calf separated from its cow.
Etymology from Wiktionary, CC BY-SA 4.0.