They look when you scoop

If you notice any changes in your cat’s feces, such as color or texture, or how often she defecates, they may have gastrointestinal problems. 

According to Dr. Pittari, “Constipation is a common yet under-recognized sign of dehydration in older cats. But if it’s attended to early, your vet can easily get your kitty comfortable again.”

Of course, you have to pay attention to the frequency and amount of urine as well. Dr. Pittari says that “increased urine output can single some of the most common illnesses in elderly cats, from diabetes or an over-active thyroid gland to kidney disease and high blood pressure.”