I had this mini shampoo sample in the bathroom and somehow my dog got to it. It was a small bottle, but there was only a little less than a tablespoon at most left in there. He chewed up the bottle and by the time we retreived it from his mouth all the shampoo was gone since he had bitten through. He's a big dog but I'm just worried if it might be poisonous? I doubt it but still, I want to make sure he's safe.