powder

My guinea pig has been having powdery mineral deposits in her urine. I am taking her to the vets tomorrow. I have read that the best thing is to do for this is to reduce her calcium intake because it is probably too high. But I am not sure how to do this correctly. Currently the pellets I give...

I was just cleaning the pigs cage out (I have fleece) and noticed a few dots of white/cream "paste" is the only word I can use to describe it. I used my finger to see what it was, it was a very powdery consistency so I'm thinking maybe too much calcium in their diet? I can't think how.. They...