Thanks, HayleyRosie and Jen!

Jen, you seem to have a lot experiences with FUS, thanks for your advice! I will ask the vet about a special diet food, and also try to get these cranberry treats. I never thought about minerals in our water but you could be right!

I've noticed that Luna started drinking more the last few months, do you think this is because of her problems?

BTW, tonight it's the first time I noticed she is losing drops of urine, so she definitely must be in some trouble, even though she doesn't complain and is acting normal. Hopefully her antibiotics will soon have an positive effect on her!

Kirsten