Thanks Claire.
Well I've just spoken to our vet and she's not happy about the blood re-appearing. In his last sample there was no traces of blood or crystals but she thinks now she needs to be more thorough.
He has to go in tomorrow to have a GA and be catheterised so she can empty his bladder for a better sample and then blow up his bladder with air to X-ray it. She's also going to send off his urine to be cultured.
Apparently because he's a boy he shouldn't get recurring cystitus due to his anatomy and she's really hoping that it's not something more serious.
We are lucky with our vet she's very good but it doesn't stop us worrying
