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As an avid horseback rider I can vouch for animals doing this. It is common for a horse to inhale (or puff-up) when they are being saddled. An experienced horseman (or horsewoman) will tighten the girth again several minutes after saddling the horse. The unwary rider who doesn’t do this may find themselves riding upside-down somewhere down the trail (I’ve actually seen it happen…most riders jump before it gets too far but I saw one saddle spin fast enough that the rider was literally upside-down between the horses legs).
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For all of my experience with horses we have had our cat do a Houdini on her harness as well. It never occurred to me she might be pulling the same trick. Houdini could dislocate his shoulder to escape and I figured since cats shoulders are already detached (no ball and socket joint…just kinda floating freely) that they could do the same thing naturally.
I’ll pay closer attention next time. Thanks for the tip Yarster!