If he usually pees outside and is pretty good about it, he may be sick to pee where he peed. I know when Yorkies are weak (like after a surgery or teeth pulling, etc), they really don't like to move much and really can't because they are so tired.
It could be he ate something else bad, I hope he's better soon! I have not heard of that concoction, if he doesn't get better in a day or so, I'd take him to the vet, as we all know it's better to be safe than sorry.
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