Bulldogs eating foreign objects
Below you will see what happens when a Buldog decides to eat lunch, except instead of dog food, she selects a bungee cord/ rocks and other debris. These type of things won't pass and must be surgically removed most times. In addition the risk of bowel puncture and infection is high. If you suspect your Bulldog has eat something, go to a vet.
Thanks for the picture Shelia!