[Stones] CARE: piggies losing weight because of bladderstones

[Cindy]

Hi.  I am new here.  My guinea pig, Sunshine, a four-year-old male, was 
diagnosed with bladderstones on Thursday.  We have surgery scheduled for 
Monday.  Unfortunately he didn't show any symptoms until about a week 
ago, when he began crying when he had to "go."  I thought at first that 
he had gas and was treating him for that. 

Sunshine used to weigh 3 pounds, 6 ounces or so.  A big guy, I know.  He 
is a rescue piggie and was already 3 pounds, 1 ounce when I met him.  He 
is now back to 3 pounds, 1 ounce.  I am concerned about his weight 
loss.  Is this normal for a piggie with stones?  I was hoping to get him 
to gain an ounce or two before surgery, but I don't know if I will be 
able to do that.

Thanks for any thoughts/advice.

Cindy and Sunshine