That's odd. I've been aware of that word for decades.
Ditto, it's been around for a decade or three, especially if we include longer phrase "eating your own dogfood" and not just the verbification.
I can't be sure but I vaguely recall it being associated with the big Microsoft antitrust court case? Along with the delightful phrase "knifing the baby"
Same as "load-bearing", but I guess that depends on everyone's non/pre-swe background.
Or house flipping TV shows
Wikipedia has the introduction of the term "dogfood" to the corporate world as a Microsoft internal memo....