Every year I end up in a rabbit hole of research and come out with a list of things I wish someone had told me sooner. Some of it confirms what most cat owners already half-know. Some of it genuinely changes things. This is the 2025 version of that list.
Kidneys, Aging, and the Muscle Thing Nobody Talks About
Chronic kidney disease is still the big life-shortener in older cats. No surprise there. What’s shifted is the push to catch it way earlier, in stages 1–2 when there’s something to work with, instead of discovering it when your cat’s already crashing. Recent consensus guidelines push hard for earlier detection using bloodwork, urinalysis, and blood pressure. (PubMed)
But here’s the part I think is underrated: a longitudinal study found that cats start losing muscle before age 10, often while their weight still looks completely normal on the scale. After 10, both body condition and muscle tend to slide together, especially if there’s chronic disease underneath. (PMC)
So your cat can weigh exactly what they weighed three years ago and still be quietly deteriorating. Muscle condition score matters. Ask your vet to actually record it, not just glance at your cat and say “looks good.”
Urinary Disease Is a Stress Problem
Feline lower urinary tract disease and idiopathic cystitis have been reframed over the last few years as stress-linked brain-bladder disease. Updated guidelines and environmental resources underline the same pattern: for many cats, flare-ups track life stress. (Edinburgh Research)
The triggers keep showing up in the same research: unpredictable routines, conflict with other cats in the house, litter boxes in loud or ambush-prone spots, not enough hiding places or vertical space, boredom.
Drugs and pain relief are still critical during an acute flare, especially for males who can block (which is a genuine emergency). But long-term management really does come down to more boxes, better locations, quiet retreats, scheduled play, and wet food. If your cat has had bloody urine with no infection found, the bladder is only part of the picture.
The Food Section (Which Got Busy This Year)
Wet vs. dry: Nothing groundbreaking, just stronger confirmation. Dry food sits at roughly 8–12% moisture, wet food around 70–80%. Cats on mostly wet diets produce more dilute urine and tend to have fewer urinary flares and less kidney strain, especially if they’re prone to FIC, stones, or CKD. (Magnolia Vets)
Phosphorus: This one’s been building quietly and deserves more attention than it gets. A 2024 review pulled together evidence that too much phosphorus, especially from inorganic additives like sodium or potassium phosphate, can damage kidneys in healthy cats. But swing too far the other way, and very low phosphorus in early CKD can cause high blood calcium and bone problems. (FEDIAF)
The 2025 FEDIAF nutritional guidelines updated the safe range for feline phosphorus based on this kidney data. (FEDIAF) Amount and source matter. If kidney health is even remotely on your radar, it’s reasonable to have your vet or a veterinary nutritionist check what your cat’s actually eating.
Feeding guides are generous. Multiple studies have found that label directions regularly overshoot calorie needs for indoor cats. (SAGE Journals) Use them as a rough starting point, then adjust based on body condition and weight trend. The bag is not the authority on your cat.
H5N1 in Raw Cat Food
This gets its own section because the risk stopped being abstract in 2025.
The FDA reported that certain lots of RAWR Raw Cat Food Chicken Eats tested positive for H5N1 after a cat who ate the product was euthanised with confirmed infection. Genetic testing linked the virus in the cat directly to the virus in the food. (U.S. FDA) The affected lots were pulled, but some had already been sold. Other raw poultry products from different companies have also been recalled over H5N1 contamination. (Worms & Germs Blog)
Human risk from handling the food appears low so far. Cat risk is very real. H5N1 can cause severe illness or death.
If you feed raw: stay current on recalls, understand that “natural” and “safe” are completely different claims, and if your cat develops sudden respiratory or neurological signs after eating raw poultry, that’s an emergency visit, full stop.
Obesity and “Cat Ozempic”
Extra weight in cats causes real internal damage. 2025 data added more detail: worse lipid profiles, higher oxidative stress markers, measurable strain on the heart. (PubMed) It’s organ wear-and-tear accumulating quietly.
The genuinely new development is GLP-1 drugs reaching cats through clinical trials.
Okava Pharmaceuticals launched MEOW-1, a trial of OKV-119: a tiny subdermal implant that releases a GLP-1 agonist over months, tested in at least 50 overweight pet cats. (OKAVA) Meanwhile, Cornell and Akston are running a separate trial on AKS-562c, a cat-specific GLP-1 fusion protein given as a weekly injection for about three months. (DVM360)
Neither is available yet. We don’t have long-term safety data. Nobody credible is positioning these as “inject and keep overfeeding.” But the fact that veterinary medicine is developing drugs specifically for feline obesity signals a real shift in how the field thinks about it. For now, portion control, food choice, enrichment, and regular weigh-ins remain the actual work.
Blood Pressure, Heart Disease, and the First HCM Drug
Hypertension in cats is sneaky. It usually doesn’t show until something dramatic happens, like sudden blindness. Guidelines keep reinforcing that older cats, cats with CKD, and hyperthyroid cats need regular blood pressure monitoring. (PubMed) Amlodipine is still the go-to, sometimes combined with other drugs.
The bigger headline: 2025 saw the first conditional FDA approval of a drug specifically targeting feline hypertrophic cardiomyopathy. It’s a sirolimus-based product aimed at modifying the disease itself. It’s early and still being evaluated, but HCM has never had a direct treatment before, so even a conditional approval is significant.
Diabetes, Thyroid, Acromegaly
Three hormone stories that keep intersecting.
Diabetes management is moving toward more home-based monitoring. Continuous glucose monitors adapted for cats are now explicitly described in guidelines as a useful option, reducing the need for stressful in-clinic glucose curves when owners are willing to learn the system. (PMC)
Hyperthyroidism is incredibly common in older cats. A 2025 study tracking quality of life in cats treated with either radioiodine or antithyroid drugs found that both groups improved over time — the bigger variable turned out to be thyroid status, not treatment type. What the data does highlight is the practical gap: difficulty giving daily medication was one of the leading reasons owners switched to or initially chose radioiodine, and a meaningful number of cats started on medication end up off it within months because owners can’t sustain the routine or the cat reacts badly. (PMC)
Underneath both of these, acromegaly (a pituitary condition) may be sitting behind more “stubborn” diabetic cases than we realise, especially in older males with very high insulin needs. If diabetes isn’t responding the way it should, IGF-1 testing is a reasonable ask.
Arthritis: Real Treatment, Real Monitoring
Radiographic studies put osteoarthritis prevalence in cats somewhere between 16% and 90% depending on how you define it. (PMC) Translation: most older cats have some degree of joint pain, and most of them are hiding it from you beautifully.
Frunevetmab (Solensia), the anti-nerve growth factor antibody, is a genuinely powerful tool. Clinical trials show real improvements in mobility and comfort. 2025 also brought a CVMP positive opinion for relfovetmab (Portela), a newer anti-NGF antibody designed to last three months per injection — a potential step forward for cats that are hard to medicate regularly. (Zoetis) But 2025’s real-world safety monitoring filled in more detail on side effects: skin problems, injection-site reactions, itching, and rare serious events including anaphylaxis are now more explicitly called out. (OUP Academic)
These injections can transform quality of life for a stiff, miserable cat. They also require you to actually watch what happens after each dose (skin changes, appetite shifts, behaviour) and follow up if something’s off.
FIP Is Treatable Now
This is maybe the most dramatic shift in feline medicine in the last decade.
Published case series with GS-441524 and remdesivir-class antivirals report remission and survival rates often above 70–80% when dosed properly. (iCatCare) A 2025 trial of molnupiravir, alone or with immune support, also reported high survival rates, giving vets a legitimate backup when first-line drugs fail or aren’t available. (iCatCare)
Legal access and quality control vary by country, so the specifics belong to your vet. But “suspected FIP” should now lead to a conversation about which antiviral options are realistic.
Parasites Follow Ecology
Parasite guidelines have gotten more nuanced, which is good. Recent ESCCAP and related guidance uses risk-based approaches instead of one blanket schedule: indoor high-rise cats, leash-walked balcony cats, roaming hunters, travelling cats, raw-fed cats are all in different risk categories and need different plans. (MDPI, ESCCAP)
Combined with the H5N1 story, the theme is simple: parasites and pathogens track ecology and lifestyle. Worth doing an annual “what does my cat actually do and eat?” check with your vet instead of renewing the same products by default.
Indoor Life and the Five Pillars
The AAFP/ISFM environmental pillars (safe retreats, separated resources, play opportunities, positive human interaction, respect for scent) aren’t new. (CVMA) But 2025 discussion tied unmet environmental needs more directly to urinary disease flares, over-grooming, aggression, anxiety, and worse outcomes in chronic illness.
Indoor-only doesn’t automatically mean safer if the trade-off is years of low-grade chronic stress in a cramped, noisy, or barren space. Sometimes two extra litter boxes and a shelf on the wall do more for your cat’s health than any supplement.
Kittens and Socialisation Windows
The sensitive period for kittens is roughly 2–7 weeks. Kittens gently exposed to humans, household sounds, and mild novelty during that window grow into more confident, easier-to-handle adults. Those who miss it are more prone to fear, aggression, and chronic stress later. (VCA Hospitals)
This matters for longevity in ways that aren’t obvious: stressed, hard-to-handle cats get less routine vet care, hide illness longer, and are more likely to be surrendered or live in unstable situations. If you’re adopting a kitten, “what happened between 2 and 7 weeks?” is worth asking.
Early Spay Is Still Protective, and a Few Other Things
Cat data still strongly supports early spaying (before first heat) as a major reduction in mammary cancer risk, which tends to be aggressive and malignant in cats. The joint-disease trade-offs debated in dog research don’t have equivalent evidence in cats. (Veterinary Evidence)
Essential oils: Some, especially phenol-heavy ones like tea tree, are genuinely toxic to cats. Cats lack the liver pathways to process these compounds. Toxicity cases keep getting reported. Heavy diffusing, topical application, and ingestion are all real risks. (MSD Veterinary Manual)
Injection-site sarcomas: Rare but serious. Modern vaccine protocols already try to minimise risk and place injections strategically. Any lump at an injection site that persists past a month or grows gets checked. Don’t sit on it.
Slow blinking: Research continues to confirm it works. Slow-blinking at your cat can help them relax and approach. It’s a small tool, but paired with calmer handling, it adds up.
So What Do You Actually Do With All This
None of this has to be an overhaul. Most of it is just: pay slightly more attention to the right things.
Book the bloodwork you’ve been putting off. Add more wet food if you haven’t. Look at your cat’s muscle, not just their weight. Fix the litter box situation. If kidneys are on your radar, ask about phosphorus.
That’s it. Pick one and start there.