my cat was going crazy in his litter box at 630am. i let him go at it for a few minutes, but the room began to smell and i figured he was having difficulty burying stuff. i got up to get a plastic bag and he ran off. i scooped everything out and spread out the good litter. i was concerned b/c a few days ago he behaved this way and after i cleaned up i noticed that he had a little blood on his posterior. the vet told me it was a funky thing that happened b/c of the amoxi drop he's been on for two weeks. i was concerned that he was having the same issue this morning, but he wasn't. he had a piece of litter on his nose. i'm wondering if i should put more litter in the box? does anyone know why a cat would dig and dig and dig in his litter box? is it just something to do? it didn't bother me, but the scent was strong and got stuck in my nose.