So this morning I had my rabbit sitting on the bed with me when I noticed there was a large pink coloured stain left from where she was sitting. She is litter trained but I’d taken her downstairs for a little while away from her litter box which is why she ended up urinating on the bed as she never goes to the toilet anywhere else when she is upstairs.
I’ve done a tiny bit of research to which I found the possible cause which is to do with calcium in the diet however, I’m not 100% sure if this is actually what it is. I’m hoping someone who’s had a bit experience with this could help me shed some light on the situation!
I will call and make an appointment with her vet asap only if it looks like something more serious as she gets herself so stressed out at the vets and I don’t want to have to put her through that unless it’s absolutely necessary.
I took a picture before cleaning up to be certain so, Has anyone ever seen this before?

Thanks in advance!