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Hi, I'm Dr. Jill. I'd be happy to help you with your question. Burrs can definitely be frustrating to get out of a cats fur. As long as they're the small round variety, any swallowed ones will most likely pass through Einstein's intestinal system without an issue. I wouldn't be concerned about Einstein eating a few regular burrs. Foxtails on the other hand can become lodged in a variety of places and cause more issues, so if there are foxtails still stuck in Einstein's fur, I would give him a break for a bit and then spend more time trying to get those out.