"farm horse," 1596 (in "Merchant of Venice"), probably from diminutive form of Dob (early 13c.), common Middle English familiar form of masc. proper name Robin or Robert; personal name applied to a horse.
1. The little boy was frightened by Dobbin's whicker.
2. This praise and confidence smote Dobbin's heart very keenly.
3. Perhaps Dobbin's foolish soul revolted against that exercise of tyranny.