
Indeed, Bladder Stones, but these are less likely to cause a blockage UNTIL they become large, than with the male who has a bone in his penis and will block up with only a small /several small stones. She needs to be checked, nevertheless - collect some of her urine, fresh, and take it with her, to your vet. Sooner rather than later too because even with a UTI, the infection can pull her down generally. And having had cystitis, IT HURTS!