from
Jargon File (4.4.4, 14 Aug 2003)
dogfood
n.
[Microsoft, Netscape] Interim software used internally for testing.
"To eat one's own dogfood" (from which the slang noun derives) means
to use the software one is developing, as part of one's everyday
development environment (the phrase is used outside Microsoft and
Netscape). The practice is normal in the Linux community and
elsewhere, but the term `dogfood' is seldom used as open-source betas
tend to be quite tasty and nourishing. The idea is that developers who
are using their own software will quickly learn what's missing or
broken. Dogfood is typically not even of {beta} quality.