We bought DD (nearly 11) two lovley guinea pigs after much nagging. The agreement was they are basically her responsibilty, she feeds them, cleans up after them, plays with them, puts them in/out of run etc. Me or DH will buy food and take/pay at vets/check they are being looked after. She promised faithfully she would do this.
However...............3 weeks on and she does do most of the reuired work but often moans/throws wobblies about cleaning up after them, which often includes hoovering the stairs and landing as she manages to get sawdust everywhere. 
She has just had a major wobblies, crying, slamming doors, knocking over wash basket, stomping on stairs over this and the fact she has NO clothes her wardrobe is full of stuff she chose, she has more clothes than me. She is going on a 5 day school trip tommorrow and decided to upack her bag to get clothes she wanted to wear today. 
I am pregnant and hormonal but at the moment I think she is spoilt and being horrible. I do love her loads. SO AIBU? and any suggestions gratefully recieved. 