A senior cat who is thinning needs two things at once: food arranged so she can actually take in enough of it, and a proper check that nothing medical is quietly taking the weight off her. Older cats lose condition for ordinary, fixable reasons, such as sore teeth, a fading sense of smell, or a bowl placed somewhere that has become hard to reach, and for health reasons that need a veterinarian. Work on the feeding while you arrange the check, and treat the weigh-ins as part of the diagnosis rather than background detail.
Make Every Mouthful Count for More
An elderly cat's digestion may extract less from food than it once did, so choose a good-quality, energy-dense food, with senior or recovery-style formulas offering more nourishment per mouthful than a light adult diet. Because her stomach capacity and appetite are often smaller, offer little and often: several small meals through the day usually add up to more eaten than two large ones she walks away from. Wet food warmed briefly to room temperature releases more smell, and smell is what an older cat, whose nose is not what it was, largely eats by.
If she has favourites, use them within reason. A senior cat who reliably finishes a particular flavour is better served by that food than by a theoretically ideal one she picks at, though if she will only eat treats or one unbalanced food, that is worth raising with your vet rather than building her whole diet around it.
Remove the Obstacles Between Her and the Bowl
Look at her feeding arrangements with her joints in mind. A bowl up on a counter she used to leap to, or down basement steps, may now cost her more effort than the meal feels worth, and a cat in that position often quietly eats less rather than complaining. Bring food and water to the level and room where she spends her day, use a shallow dish that is easy to eat from, and keep the spot calm and away from younger, bouncier animals who may muscle in.
Check her mouth, too, as far as she will let you. Dropped food, chewing on one side, or new reluctance with dry food can point to dental soreness, which is common in older cats and very fixable compared with most causes of weight loss. Softer textures are a sensible bridge while you wait for a dental opinion.
Weigh Her, and Believe the Trend
Hands are better than eyes for judging an older cat's condition, especially a long-haired one whose coat hides a thinning frame. Run your palms over her ribs and hips weekly, and weigh her if she tolerates it, writing the results down with dates in your own notes. A stable weight on the new feeding pattern is reassuring. Continued loss while she appears to eat well is exactly the pattern a vet needs to hear about promptly, because several common conditions of older cats show up first as weight sliding away despite a decent appetite.
Call the vet sooner rather than later if the weight loss comes with increased thirst, a ravenous or vanished appetite, vomiting, looser stools, or a change in her energy and habits. Those combinations deserve investigation, and arriving with a few weeks of honest weights and appetite notes makes that first appointment far more useful.
Routine Helps an Old Cat Eat
Senior cats lean on routine. Meals at predictable times, in the same quiet place, served by familiar hands, all lower the effort of eating to something she can manage on a tired day. If she leaves food, offer a fresh small portion later rather than leaving the same bowl to stale, and keep a note of which meals she finished; appetite that dips only in the evenings tells a different story from appetite that has gone altogether.
Storing her weights, appetite notes, dental findings, and feeding plan together in KinsLe's Pet Passport means the slow story of her condition is written down in one packet you can hand over at every appointment.