Lol yeah dog food ran through my head a time or two.
Caned dog-cat food has about a 2 maybe 3 year shelf life but I would give it at least a year after shelf life before any thing canned really starts to go bad maybe even longer if the can does not start to rust ect.
I have ate stuff that was in the cabinet when i was to lazy to go shopping then look at the can and it went out of date 2 years ago.Done it a couple of times never got sick so out of date dog food we should be good lol.
how ever the game clock is at 8x so every 6 weeks is a new year, last i saw a totem said it was "month day 38" so im guessing its 2038? were talking like almost 30 years since the apoclypse happen in the game.