To eat one's own dog's food; literally to consume the food intended for one's pet.
2.
United StatesUnited Kingdomgeneralinformalcomputingbusiness
To use internally the products or services that one produces or sells in order to test them, demonstrate confidence in them, or understand their limitations.
3.
generalidiomaticeconomic
To consume or use the economic goods one produces; to participate in a closed or self-sustaining household or organizational economy by relying on one's own output.