@Kevin-s0 I get the same nonsense from guests who neither read nor comprehend. You could add No Children etc. at the start of your description, not a guarantee but more might pay attention.
If they are just inquiries see link here for details - you must respond within 24 hours, a message to them suffices and it stops the clock ticking. Double check by reloading the page to make sure the clock has stopped. I never decline inquiries I just respond and leave them, they will come up again in notifications but I just ignore it because the guests haven't replied to me, the clock is stopped and there is no penalty (that I have noticed), and it also means I do not add to my declines.
If they are actual 'Reservations' you have to accept or decline but you have 24 hours. I respond asap and tell them no pets etc. and suggest they cancel their booking. btw: Never cancel a confirmed reservation even if Airbnb asks you to, you will be penalized, always make sure the guest does it, it is afterall their mistake.
Or call Airbnb and discuss with them, they can cancel the booking penalty free and no declines for you. Good luck it can be a pain when you get a ton of no-read-description guests in a row.