From en.wiktionary.org:
[dobbin]
** English
[wp]
*** Etymology
From [en]; thus archaically equivalent to [en]. Cognate with [en].
*** Proper noun
[en-proper noun]
1. [en] .
2. [A pet name given to workhorse s] , and by extension, a [placeholder name] used for any workhorse, much like [en] and other such placeholders are used for people.
3. * [page=168]
4. [en] .
5. [en] .
**** Derived terms
- [en]
**** See also
- Appendix:Names of pets < !--Some of these are used in the placeholder way-->