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I was walking Big on a beach when I noticed him eating something.

it was human poo.
I took him to the dog wash place and gave him a complete wash down. But he has become very ill. Currently waiting on various vet test results.
BUT what I did learn is the sort of person who poos on a beach is very likely to be stoned. And the drug levels in a stoned person's poo are very high. I assumed meth' and the vet said marijuana is VERY bad for dogs. Pancreas or liver, or something.