Join Date: Jun 2008
Location: northern Minnesota
Re: Cat urine with no odor? Is it even urine?
As Christine said, kidney failure is fairly common in elderly cats. It can also occur in younger cats, but not nearly so frequently. Even if your girl does have kidney disease, there is much that can be done to manage the disease, esp. if it's caught early.
Another disease that can cause excessive thirst is diabetes. Is your girl overweight, by any chance? How is her appetite? Again, if she has diabetes, it is a manageable disease. In fact, many cats with diabetes go into spontaneous remission.
When you go to the vet, request a full blood chemistry. That'll tell you about her organ function (including her kidneys) and blood glucose level. A urinalysis will help diagnose UTI, and a quick check under the microscope will tell if she has crystals in her urine.
There is no need to panic. It's still perfectly possible that your girl's inappropriate elimination is strictly behavioral and that she's completely healthy. Just get her checked out and have a blood test and urinalysis run so that you can get some answers.