My cat has had cystitis a few times over the years, it usually clears up after a jab at the vet and a day of pills.
This time we are on day 3 and she is still trying to wee in random places and only dribbling.
Took her back to the vet and they’ve said if it hasn’t cleared by Monday then we’ll investigate further 
Has anyone had a cat with a persistent bout of cystitis or should I prepare for the worst?