So my 4 year old orange tabby, Bert, has a bladder stone larger than a pea. I noticed bloody urine and he was the closest cat, so I took him in. He peed while at the vet, and it was bright red. Vet said his ph is good, not sure what else. So what is a bladder stone? Is it crystals? What kind? His surgery to remove it is scheduled for Thursday. Said they will analyze it then. I've had a cat with struvite crystals before. Henry had PU surgery 2 years ago and has been fine ever since. Is bladder stones similar? Or totally different?