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Ditto. The kind of yogurt that you get at
WalMart like mainstream brands, they do tend to go bad, but they will smell funky and you will know it.
I had a jar of super-organic stuff in a glass jar, man I kept some of it around for over a year, expected it to be bad but I opened the jar just to see and it really looked/smelled ok. That's a bit extreme, but so long as the GOOD bacteria are in control the yogurt is still good. If the bad bacteria take over, it turns. Refrigeration only slows the bacteria growth (good and bad) it doesn't completely stop it.
I used to make my own buttermilk too, using some from the store as "starter" and putting a small amount into a gallon of new milk (it was specifically NOT homogenized and only regular pasteurized, NOT the ultra-pasteurized crap) and letting it set out overnight to allow the bacteria to grow a bit before putting it back in the fridge. I would repeat the process with a starter from my last gallon whenever I had to buy a fresh one. Also a good way of "saving" milk that is getting close to expiring. Like yogurt, it never really went bad, at least not for a LONG time (as milk goes anyway) I once threw out an empty in December, that was dated for the previous May, and it was still good.
Sour cream gets that same green fuzz that cheese does. We cut the green off the cheese and eat it anyway. I scrape the green off the sour cream and feed it to the dogs all the time. Chickens really aren't any more sensitive than dogs, ever seen them eat roadkill?? LOL