one of them is like a spring chicken-touch wood! the other one is very,very thin now..and so bony.last time she went,vet reckoned she could possibly have a fast metabolism/thyroid problem.i know how much the vets scares her and i keep thinking that maybe i should give them both quality of life at this stage rather than scaring them to death at the vets....by the way,i'm not giving up on them by any means,i absolutely adore both of them.just don't know whether i need stress them out for no reason at this time in their lives.