12/29/2025
The open-mouth sniffing face is caused by something called the โflehmen reaction,โ and itโs perfectly normal. When your feline friend takes a sniff and leaves its mouth open for a few seconds, itโs actually drawing air into the mouth and up into Jacobsonโs organ. This action helps the organ to process the scent more deeply than your catโs nose can and sends signals to your catโs brain. Usually, cats will have the flehmen reaction when sniffing urine or f***s from another cat, since these substances contain pheromones. Do your cats do this?
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