bladder

My Guinea pig, lucky (ironically), is a female and she's about 4 and a half years old. She's got a sister who's much much (about .5lb) heavier than she is and my Lucky got much thinner over the past few months, you can feel her bones all over. Recently I've heard grunting and squeals (painful)...

I have never had a guinea pig with a bladder issue, and I am trying to work out what, if anything, I do differently to most people. You could just say I have been lucky, but I have had a large number of guinea pigs over the years and no problems. Just under two years ago I took in a guinea...