https://www.vetnurse.co.uk/f/nonclinical-discussions/17733/bright-orange-urine Had to have one of my dear guinea pigs put down yesterday from a bladder tumour. She was 5 and a half years old so had a good life. I noticed some orange urine in the run yesterday and assumed this was one of her symptoms. Only when I came back fromen-USTelligent Community 10https://www.vetnurse.co.uk/thread/131013?ContentTypeID=1Mon, 21 May 2012 08:15:53 GMT1a0763ec-3885-442c-853e-6cef656dfec5:89956cc2-9ec6-4d68-8b1e-65e142f09067F1chick<p>Oh hugs! Possibly porphoryns or ?Billirubin? Just guesses. Sorry IDK</p> <p>&nbsp;</p> <p>Big hugs and let us know. xxxxx</p><div style="clear:both;"></div>https://www.vetnurse.co.uk/thread/131001?ContentTypeID=1Sun, 20 May 2012 18:37:27 GMT1a0763ec-3885-442c-853e-6cef656dfec5:c2ad4e5f-323b-4acb-8fb2-ad7607e610b5Alison Clare Hickman<p>Hi,&nbsp;Normal urine in an adult guinea pig is thick white to yellow colour. That said, I have read somewhere that it is a normal occurrence if it is left standing (the urine) due to the oxidation of any porphyrins. It might mean she is dehydrated, so that&#39;s not good and she needs a check up. Or it might indicate a bladder infection. It might also mean she has been eating a lot of highly coloured foods e.g. carrot?? I think a vet check is the safest option, just to be sure. I hope she is okay. My best wishes to you and to her. Thinking of you.&nbsp;</p> <p>Ali</p> <p>&nbsp;</p><div style="clear:both;"></div>