My 11 month old large mix ate a lot of sticks and threw up at 4 am the next morning. Then acted fine (no change in appetite or behavior and no vomiting) for the rest of the day and night before throwing up again this morning at 4 am. There is no dog food in it; it is only wood chips and stomach acid. She did not get into any sticks yesterday, so the wood from this morning is without a doubt from two days ago (she's had 3 full meals since she ate the sticks). Can her chewed up bits of wood just sit in her stomach while her food passes right through? Should I be worried about this?