its not a metal ring, they think its plastic, and i think i know exactly what it is...

we replaced a shower head about a week and a half ago, i think one of the small rubber O rings fell out somehwere and he ate it... it possibly could have fallen into the food dish or something, i dont know...

what was weird, is the day before he started acting sick, he came flyin into the office and jumped up in the window and was staring at me weirdly... then he bolted out, that night, he started acting sick like, and it got worse the next few days till we took him in...

for all i know, this could be my fault, but i cant be sure until he sh!ts it out...