When human, something will smell off about him and vaguely big-cat like. When he's a cougar, he smells like expected, but with a mild touch of human scent sometimes clinging to him if he's freshly transformed. If he's halfway between transformation, the scent is a mishmash of the two.
While human: weirdly... nothing? Very faintly of cat but otherwise largely lacking any identifiable scent. (Still locatable via scent alone, but good luck trying to describe it) While an animal: textbook example of said animal. Like someone found the exact average proportions of every chemical that makes up an animal's scent and used that when making him
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While an animal: textbook example of said animal. Like someone found the exact average proportions of every chemical that makes up an animal's scent and used that when making him