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What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:，这一点在PDF资料中也有详细论述
但她也指出，與香港僅一河之隔的廣東深圳，也是寵物友善風氣盛行。「他們的狗狗已經能自由進出商場，餐廳也有些戶外範圍，他們（飼主與寵物）可以坐在一起吃東西。」，推荐阅读PDF资料获取更多信息