Too bad about the dog ... I know that we saw a ton of crabs out on Friday night, I must have crushed a hundred of them walking through the rocks.
But as for labs eating garbage, my buddy and I were on Ram Island just outside of Mystic, CT, we rowed out there with his black lab, it's private but we did not care all that much ... there was a dead seagull, the dog ate it and spit it back up within a span of a few seconds, never saw anything like it ... totally disgusting.
Also, a lab of one of my former bosses got caught in his tackle box, a lure was hooked on its nose and lower jaw forcing the dog not to open its mouth ... he had to take the poor pup to the vet, after they removed the hooks, the dog puked up a pair of socks in a ball, some plastic army men and a variety of other items ... don't know if he is still alive, but crazy.