Smokey and P.C. both got into some glass a few weeks ago. Don't know where; we scoured the yard and picked up everything but didn't see any.
P.C. cut his foot. A little later Smokey threw up and when I was cleaning I saw a piece of glass in it. Then, last week when I was picking up poo, I saw a piece in some poo, too.

But there was no bleeding or anything.

Just my experience here...