this will be my first suggestion and im sorry is this has already been suggested i skimmed through the first like 10 pages and didn't see anything so here i go

well my suggestion is fairly simple
if you have have you main lion up for studding and his slots reach 0 and someone tries to send a request there should be a pop up thing similar to the one if you to to request with a lioness with low mood/hunger


example messages
it could say something like
"this stud is currently out of slot pleas try again later"
Or
"this lion is out of slots, either try again next time or pm the person"
suggested by HappyHalloween! (lights on)Zia (#60468)

Other user suggestion

If the stud out of requests a pop up does appear when send the request however the request still goes though. Suggested by Isabella Lena (#49545)

maybe it could be like in transfers. if the king is out of slots and you press the stud request button a warning could come up saying that he is out of slots BUT have a button underneath saying 'are you sure you still want to send the request?Meso - CC &
Sassy (#49519)

thank's for reading good/bad feedback is appreciated ^.^