I am very sorry! Sadly, stones and urinary tract problems are very common in guinea pigs because their urine is naturally alcaline, so calcium can build up.
The good news is that bladder operations in sows are generally pretty straightforward with a good recovery rate. Several of my piggies have needed bladder operations over the years, and they have all made it through the op well.
Here are the things that you can do for your girl:
- filter your water and make sure that she drinks plenty
- give her either 1/4 of a vegetarian/vegan glucosamine human tablet (if necessary, dissolved in a little bit of water) or syringe barley water (cook barley in a bit of filtered water for 20-40 minutes, then strain and syringe as much of the strained, gloopy liquid as your girl will take several times a day). This is to coat and protect the irritated bladder walls.
- put her on a low calcium diet:
https://www.theguineapigforum.co.uk/threads/low-calcium-diet-for-bladder-piggies.105930/
For the IS diet, just feed only the veg in the amounts that are listed under "daily veg" in our general diet guide:
https://www.theguineapigforum.co.uk...or-a-balanced-general-guinea-pig-diet.116460/
- weigh her daily at the same time in the feeding cycle. Stones are very painful and that can cause loss of appetite. Have hand feeding stuff at the ready so you can step in to make sure that she is in as good a shape as possible when she has her operation. Please don't wait too long with the operation, as some guinea pigs can suddenly go downhill very quickly depending on the size and nature of the stone; in that case, you need to operate asap.
https://www.theguineapigforum.co.uk/threads/complete-hand-feeding-guide.115359/
- most other stone dissolving treatments that have been touted around in the last few years have sadly not stood up the test.
