[Stones] Treats for Guinea pigs who have crystals in urine

[Evelyn Baker]

My six year old guinea pig has crystals in her urine. She's been Cavy  
Cuisine since she was one year old. I have avoided the obvious things  
that contribute, alfalfa, dandelion, parsley etc. But now she has  
recurring bladder infections and some crystals.

Recently, I've started giving her pet grass. Of course, it doesn't  
always say what kind of grass. The seeds you grow yourself are  
usually labeled as oat grass. I've also been getting wheat grass from  
the organic store. Could this be a contributing factor?

What alternate fresh grasses can I give her or grow for her. Is  
fescue, (lawn) acceptable. Also, I've been giving her mixed greens  
but that has spinach in it.

Evelyn