1) Smell it. If it smells unappetizing.. It's probably not good anymore. Trust that nose!
2) Usually, beef comes in a bright red color. When the beef is exposed to too much oxygen over time, it oxidizes and produces a gray-brown color. You can tell by this color that the beef is not good anymore.
IN SUM: smell and color
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It is best not to consume any canned food past it's printed expiration date. In theory, (tread carefully!) it will last indefinitely if the can is in good shape, but all canned food becomes progressively more tasteless and unpleasant to eat as it ages, even if it is not poisonous.
So the best approach is the first sentence of this answer.
If the meat smells bad, it is bad. Even if it still looks red it can still be bad. But grayness is a pretty good indicator, if it looks bad, and smells bad, it's definitely bad!
get a lab to test it. However a very effective rule of thumb with pork is that if you have any doubt at all you toss it out.