Any of your kitties mouth breathers?

[u/Foreign-Speed-3767]

[u/Reason_Training]

Only when his nose is blocked by a cold or allergies.

[u/No_Tamanegi → u/Reason_Training]

Could also be the flehmen response, which is when a cat will open their mouth slightly when experiencing an interesting smell. This allows them to smell whatever it is even better and get more information about it.

It looks kinda like they're making a stink face when they're doing it.

[u/Soggy_Waffle303 → u/No_Tamanegi]

I’ve always wondered why my cat does this. 😭

[u/DonutWhole9717 → u/Soggy_Waffle303]

It's similar to a person keeping their mouth open while sniffing a whisky for taste testing