missed this. they do wet poos at night that they are supposed to eat. but can get up set tums too that give runny poo
good advice inc a list of what they can and cant eat on
http://goldenbunnies.org.uk/index.php but all rabbits are not the same some can eat only veg n hay an be fine, but some will have belly ache on some things but not others.
like some one said above fly strike is big worry this time of year, you can get stuff to help keep flys away but bums should also be checked daily.
dont forget mixi jab twice a year an another jab too that i always forget the name of