Mine chewed everything in the yard...
...but didn't swallow much at all. Chew and spit after he was bored with it.
Once he chewed up a small plant that had thorns and a section of the plant about 3 inches long embedded by two its thorns in his pallet. We didn't notice the stick until about two days of poor eating took place.
It was stuck up in the roof of his mouth like it was embedded with treble hooks. It was a bear to pull out.
But afterwards the dog was back to normal. I'm grateful as all get out he didn't swallow that thing.