I"m so very sorry this is happening. Obstructions can come from anything. A friend had to have a bully stick surgically removed. Another lost a dog because of a sock. Dogs get into garbage and eat bones or other things. I've literally pulled a skineez out of Faren's throat as she was swallowing it. This shouldn't be a raw diet vs kibble debate. Obstructions can happen from anything. Our thoughts are with you.