For a more comprehensive article check out this link:
http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm208365.htm
Obstruction due to bone.
(Photo from: http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/stomach-intestine-liver-or-pancreas/endoscopy-to-remove-foreign-objects-in-dogs)
References:
FDA Consumer Updates
Parr JM, Remillard RL. Handling alternative dietary requests from pet owners. In: Vet Clin Small Anim 44 (2014) 667-688.