Puppies eat things. It's what they do.
To the right there is Jake, and he's only 3 months old. The knife you see is the knife that he ate, WHOLE. It's only seven inches long...
The knife worked its way past the larynx, through the pup's stomach, into his intestines, when owner John Mallett noticed that Jake was strangely reluctant to curl up. No wonder:
They operated, and a day later Jake was his happy rolling-up self again.