Cats purr when they're apparently content, but they may also do so to calm themselves amid stress, according to blogger Steve Dale, who explores cat behavior in this post. Excitement could explain furniture clawing, and cats who roll onto their backs are probably not seeking a belly rub. Cats licking their lips are not doing so to indicate hunger; rather, they may be displaying a sign of nausea. Unlike that of their canine counterparts, cat behavior can be difficult to understand and easy to misinterpret, Dale writes.
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