The aging cat: what to actually monitor at home

Feline medicine distinguishes a mature stage, a senior stage and a geriatric one, and the shift into older age begins far earlier than anyone living with a still active cat would imagine. A cat enters older age while it still jumps and plays in the evening, and this appearance of normality is what delays check-ups. The most important change, once this threshold is crossed, concerns the frequency of visits: in an older animal a yearly visit covers too long an interval, because in twelve months an age related disease has time to progress without obvious signs.

This is why the established recommendation for the senior cat is a check-up twice a year, with weighing at every visit and, when the vet judges it useful, blood and urine tests and a blood pressure measurement. It is about looking at the values while they can still be changed, instead of discovering them once the disease is already advanced.

Three conditions dominate senior cat medicine and share an awkward trait: at first they show up through everyday signs that are easy to blame on old age. They are chronic kidney disease, hyperthyroidism and diabetes. Each has a different profile, but all three can appear with more drinking and more urine, and this is exactly the signal that the person living with the cat can catch before anyone else.

• Chronic kidney disease: one of the most common conditions in the older cat. Typical signs are increased thirst and urine output, gradual weight loss, reduced appetite and a less well kept coat. It cannot be cured, but it can be managed, and early management changes the course.
• Hyperthyroidism: an overactive thyroid gland speeds up the metabolism. The classic picture is a cat losing weight despite eating a lot, often more vocal, more restless, sometimes with vomiting or loose stools and a neglected coat.
• Diabetes: it appears with heavy thirst and urination and with weight loss, often in an overweight cat or an older male. It is serious but treatable, and caught early it can improve significantly.

The table is not there to diagnose at home, and none of these signs points to a single cause. It serves another purpose: turning a vague impression into a precise observation, with a number and a date, so the vet holds a useful description rather than a generic "he seems a bit off". More drinking and more urine remain the common thread that always deserves investigation.

There is a widespread and mistaken idea that an old cat is supposed to lose weight, as if it were an unavoidable consequence of age. In cats the opposite is true: weight loss in an older animal is almost always the first measurable sign of a disease, and it often appears months before any other obvious symptom. The problem is that this loss is sneaky: it happens slowly and the coat hides it, so the person who sees the cat every day does not notice the difference. Only the scale makes it visible.

The most deceptive case is the cat that loses weight while eating well or more than usual: instinct suggests a good appetite means good health, but in hyperthyroidism and diabetes it eats and loses weight at the same time, because the body no longer uses properly what it takes in. This is why weight should always be read together with appetite, and this combination is one of the strongest reasons to book a visit without waiting.

In dogs joint pain is visible: the animal limps, stops, obviously avoids the stairs. In cats almost never. Feline osteoarthritis, very common in older animals, shows up not as a limp but as a slow reduction in what the cat chooses to do. It jumps less, picks lower surfaces, hesitates before a jump it once made without thinking, uses the high sided litter box with more effort, grooms the hard to reach areas less. These changes are easily read as laziness or age, when they are the signature of a chronic pain that can be managed.

The same is true of the mouth. Dental disease is common in the adult and senior cat and causes real pain, but the cat often keeps eating because hunger prevails, and so the problem stays hidden. The signals are indirect: a preference for wet food, a tendency to chew on one side, dropped morsels, particularly unpleasant breath. A cat that stops crunching its kibble or eats with obvious caution deserves a look at the mouth.

• Osteoarthritis: fewer jumps, resting low down, hesitation before climbing, difficulty with the high sided litter box, reduced coat grooming.
• Dental disease: preference for soft food, chewing on one side, strongly unpleasant breath, dropped morsels.
• In both cases the cat shows not pain but withdrawal: it does fewer things, without looking as though it hurts.

Some signs of age go almost always unnoticed because they concern something less visible than appetite or movement. High blood pressure is one of them. In the older cat it is often linked to other diseases, including kidney disease and thyroid problems, and uncontrolled it can damage the eyes suddenly, up to a vision loss that appears overnight. A cat that bumps into objects, that has widely dilated pupils even in full light, or that seems disoriented at home deserves a blood pressure measurement and a vision check without delay.

Then there are the behaviour changes that build up over the years. Insistent night vocalisation, moments of disorientation, a cat that gets lost in rooms it knows, that sleeps by day and switches on at night: these signs can have medical causes, such as blood pressure or pain, or reflect age related cognitive changes. Telling them apart is the vet's job, but only the person living with the cat can describe when these episodes began and how often they recur, and this timeline guides the assessment.

The value of the person living with an older cat is not to diagnose but to notice and record trends. A simple diary, kept consistently, turns scattered observations into a line the vet can read in a few seconds. There is no need to measure everything every day: a handful of indicators collected the same way each time is enough, because consistency matters more than volume.

1. 1

   Weigh the cat on the same scale

   Every two or three weeks, at the same time and the same method. Note the value and watch the trend, not the single number: what matters is the direction over time.

2. 2

   Watch water and the litter box

   Note whether water intake rises and whether the litter is wetter or changed more often. More drinking and more urine are the signal that accompanies the main diseases of age.

3. 3

   Record appetite and litter box output

   Note how much it eats and how willingly, and keep an eye on stool and urine. A cat that eats well but loses weight, or that changes its elimination habits, should be flagged.

4. 4

   Look at coat and grooming

   A coat that turns dull or matted, with dandruff along the back, often means the cat can no longer groom itself, typically from pain or illness. A monthly photo helps you compare.

5. 5

   Note changes in movement and behaviour

   Record which high surfaces it has stopped using, whether it hesitates to jump, whether it vocalises at night or seems disoriented. These data describe pain and cognitive change.

6. 6

   Learn to measure the resting breathing rate

   Counting breaths while the cat sleeps quietly gives a useful baseline. A stable rise in the resting breathing rate, or open mouth breathing, should be reported straight away.

Alongside monitoring, a few changes to the environment make life easier for an older cat starting to feel pain or lose agility. A litter box with one low side, easy to step over, prevents effort and accidents. Warm sheltered beds help sore joints. Bowls reachable without jumps, steps or ramps up to favourite resting spots, and surfaces with good grip reduce strain and preserve the habits that give comfort. Small adaptations that make the difference between giving something up and carrying on doing it.