Red urine / haematuria
Bloody urine (haematuria) Is quite common in ferrets. True cases of blood in the urine are often due to stones/sludge within the urinary tract, cystitis, prostatic abscessation or abortion.
Struvite (urinary crystal) formation can be caused by feeding a diet low in animal protein and high in plant protein. As ferrets are obligate carnivores, they should be feed a quality diet with a high animal protein content and low carbohydrate which will maintain the acidity of the ferret's urine.