The only thing you have to be careful about is to not get overrun with fleshly made canon. Let's say the guy build 5 new canon in range of the spine. You will be able to kill 2 at least (they will be cancelled), but the other 3 will eventually be completed and kill that single spine. To prevent this, just hit the drone twice as it get in range to build canon. Two spines definitively make it a lot more managable thought.
If you ever play protoss, it's the same deal. The best counter to canon is more canon next to your nexus/building to block the push. Stalker can work better at time, but usually, dropping a forge immediatly after you see the canon push work the best.
On terran, let him push, then lift off and move to the safest expand while building reaper. Once you get 2 reapers (or more), it's usually gg.
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