My cat has Idiopathic Cystitis, which means the cause is psychological -- he has blood in his urine and over-grooms like crazy. The reason seems to be a stray cat who comes thorugh our catflap and eats his food.

After a blood test and trying steroids, the vet suggested a natural product called Zylkene, made from a protein found in milk. He is taking 75 mg a day for his weight (5 kg) and this has gone a long way to calming him down.

I live in the UK. If you cannot find the product in the US, Google it and order it from here. I ordered 100 from http://www.pills4pets.co.uk/search.a...03170013419269 for about $50 + Post and Packing.