Hello, and sorry I did not respond earlier. I hope your boy is feeling better by now. It is a good idea to check the stools when your dog eliminates for signs of the chew toy. Having owned many dogs with a '' Hoover reputation'' I got used to this nasty task. However, it helps provides peace of mind.Generally it should pass within 48-72 hours if it does not get lodged in any areas in the curvy intestinal tract as it passes through..Vet's opinions vary when it comes to dogs swallowing stuff. Some vets are extra cautious and recommend x-rays right away while more conservative ones may suggest a wait and see approach. Watch for signs of trouble defecating, loss of appetite, vomiting, abdominal pain, hunched position, lethargy and drooling. Remember to always replace your Nylabone when it becomes too small for your dog to chew safely. Best wishes!