It does sound like stress. Any time our other terrier experienced stress, the first thing it affected was her bowels! The vet suggested pepto bismol tablets so we kept them on hand just in case (she was 20 lbs and we used to give her 1/4 of a tablet..sometimes 1/2), but I'd check with your vet first as yorkies are much smaller. It sounds like it's probably clearing up though.
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