Every month, new research on cat health gets published. Most of it flies under the radar. We read through the January 2026 stack and pulled out the findings that matter for people who live with cats.
Here’s what stood out.
1. Molnupiravir Works for FIP (Now Backed by a Real Clinical Trial)
This is huge. A Colorado State University trial treated 73 cats with confirmed FIP using oral molnupiravir for 84 days. 77% survived to six months. Cats that relapsed (about 1 in 8) all went back into remission when retreated.
What this means for you and your cat
If your cat is diagnosed with FIP, this is now one of the strongest pieces of evidence that antiviral treatment works. Molnupiravir is oral, well-tolerated, and didn’t cause any serious side effects in this trial. The key prognostic factor was bilirubin at diagnosis. Cats with high bilirubin were more likely to die, so early detection matters.
The details
- 73 cats, open-label trial (no placebo group)
- A subset of 41 effusive-FIP cats were randomized to also receive an immune stimulant (LTC). The LTC made no difference
- Relapse window: 9–99 days post-treatment
- Bloodwork normalized in survivors
The lack of a placebo control is a limitation, but the results are consistent with other FIP antiviral studies. Some authors have equity in the LTC startup, though that’s the part of the study that showed no benefit.
Source: Černá et al., Journal of Feline Medicine and Surgery, Jan 2026. DOI: 10.1177/1098612X251403283
2. Watch the Kidneys after Hyperthyroidism
A UK study tracked 19 hyperthyroid cats after treatment and found that creatinine rose within the first month, while SDMA didn’t budge until months later. Baseline SDMA did not predict which cats would develop kidney problems.
What this means for you and your cat
If your cat is being treated for hyperthyroidism (usually with methimazole), don’t assume normal pre-treatment SDMA means the kidneys are safe. Kidney function should be rechecked at 1 month and again at 3–9 months regardless of what the initial numbers looked like.
The details
- 19 cats, retrospective, single UK referral center
- Creatinine rose significantly by month 1 (p=0.003) and kept climbing
- SDMA only rose at the later timepoint (p=0.039)
- Among cats that became azotemic vs. those that didn’t, baseline SDMA was the same (p=0.42)
Small study, no dietary or hydration controls. But the pattern (creatinine moves first, SDMA lags) is useful to know.
Source: Cox et al., JFMS, Jan 21, 2026. DOI: 10.1177/1098612X261418859
3. FeLV Is Still Common and Vaccination Rates Are Dropping
A 4.5-year study of 1,124 cats at a Lisbon veterinary hospital found FeLV prevalence at 11.3%. Nearly three-quarters of FeLV-positive cats were sick. Meanwhile, vaccination rates collapsed from 14.2% to just 5%.
What this means for you and your cat
- If your cat goes outdoors, interacts with strays, or lives in a multi-cat household, make sure FeLV vaccination is current
- If your cat tests FeLV-positive, ask your vet about staging (progressive vs. regressive infection). Progressive cases carry 62× the lymphoma/leukemia risk. Regressive cases can live much longer
- None of the vaccinated cats in this study tested positive
The details
- 1,124 cats across pet, stray, and shelter populations in Lisbon (2019–2023)
- Highest risk: intact males, ages 1–6, with outdoor access
- FeLV peaked at 14.1% in 2020
- Most common FeLV-associated conditions: lymphoma (18.7%), anemia (17.8%), leukemia/myelodysplastic disease (15.9%)
This is a single-center hospital population, so it skews toward sicker cats. But the vaccination decline is concerning and likely not unique to Portugal.
Source: de Almeida et al., PLOS ONE, Jan 8, 2026. DOI: 10.1371/journal.pone.0339172
4. Senior Cats Eat 6–7 Small Meals a Day (Not the 3–4 Guidelines Suggest)
A study of 134 healthy cats aged 7+ tracked actual eating behavior using automated feeders in their homes. Cats averaged 6–7 meals per day, with peaks at dawn and dusk. Cats on wet food ate fewer calories than those on dry.
What this means for you and your cat
Senior cats naturally graze about 6–7 small meals a day, peaking around dawn and dusk. Current guidelines suggest 3–4 meals. Your cat’s instinct says otherwise. If you’re feeding an older cat, timed dispensers or puzzle feeders set for multiple small portions may better match their biology than two big meals.
The calorie finding is also worth noting: cats on wet food consumed substantially fewer calories under ad libitum conditions (138 kcal/day vs. 263 kcal/day on dry). That’s relevant if you’re managing weight but don’t assume 138 kcal is the right target. This was free-choice eating, not a prescription.
The details
- 134 cats, randomized crossover design, three diets (dry, wet, mixed)
- Meal frequency: dry 6.0/day, wet 6.9/day, mixed 7.2/day
- Caloric intake: dry 262.6 kcal/day, mixed 222.6 kcal/day, wet 138.1 kcal/day
- Feeding peaks aligned with crepuscular rhythm (dawn/dusk)
Industry-funded (Royal Canin/Waltham). Ad libitum design, so it doesn’t reflect portion-controlled feeding. Cats with sarcopenia risk may need more calories than the wet-food group consumed.
Source: PMID 41514733, published Dec 2025, indexed Jan 2026.
5. Indoor Cats Aren’t More Stressed Than Outdoor Cats
Researchers measured hair cortisol (a marker of chronic stress) in 34 cats (16 indoor, 18 with outdoor access) and found no significant difference.
What this means for you and your cat
Outdoor access alone doesn’t reduce stress. What matters is the quality of the indoor environment. Indoor cats in this study had more litter boxes, hiding spots, vertical space, and toys. Cats showing behavioral signs of stress (hiding, excessive vocalization) had higher cortisol regardless of indoor/outdoor status.
If your cat is indoors, focus on enrichment with multiple litter boxes, climbing structures, interactive play, hiding spots. That matters more than a cat door.
The details
- 34 cats in Brazilian homes, hair cortisol measured via ELISA
- Indoor: 2.40 pg/mg, outdoor: 2.62 pg/mg (p=0.51)
- Owner-perceived stress did not match actual cortisol levels
Small sample, single region, survey-based. Hair cortisol is still a relatively new biomarker with some variability.
Source: Lima et al., Journal of Applied Animal Welfare Science, Jan 4, 2026. DOI: 10.1080/10888705.2025.2610233
6. Dental Health: Brush Daily
The FelineVMA published updated dental care guidelines, and the message hasn’t changed much. But it’s worth repeating because dental disease is still one of the most underdiagnosed problems in cats.
What this means for you and your cat
- Daily toothbrushing with cat-specific enzymatic toothpaste is the gold standard. Start early if you can
- If brushing isn’t realistic, use VOHC-approved dental diets, chews, or water additives. They’re guideline-endorsed alternatives (not equivalents)
- Anesthesia-free dental cleanings are not recommended. They address cosmetic tartar but can’t treat disease below the gumline, which is where the real problems are
- Professional dental cleanings under anesthesia are safe and necessary
Periodontal disease prevalence rises sharply after age 3. If your cat hasn’t had a dental evaluation recently, it’s worth scheduling one.
Source: FelineVMA, JFMS, Nov 2025 (widely promoted Jan 2026). DOI: 10.1177/1098612X251398793
7. Tylenol Is Now a Top-10 Pet Poison and There’s No Safe Dose for Cats
Pet Poison Helpline data for 2025 put acetaminophen (Tylenol, paracetamol, Panadol) into the top 10 pet poisons by call volume for the first time.
What this means for you and your cat
Cats cannot metabolize acetaminophen. They lack a liver enzyme (glucuronyl transferase) that humans and dogs have. There is no safe dose. Even a fragment of a standard tablet can be fatal. Signs include facial swelling, brown or muddy gums, labored breathing, and lethargy. If you suspect exposure, this is a drop-everything emergency.
With cold and flu season driving more of these medications into households, double-check that all acetaminophen-containing products (actually, all pills) are stored completely out of reach. This includes combination cold medicines that people don’t always think of as “Tylenol.”
Source: DVM360 / Pet Poison Helpline, Jan 18, 2026.
8. Kidney Disease Starts Earlier Than Bloodwork Can Show
A multi-omics study mapped molecular changes across CKD stages in cat kidneys. In early-stage CKD, the inner kidney (medulla) already showed about 2,000 differentially expressed genes. The outer kidney (cortex) showed just 6.
What this means for you and your cat
By the time standard bloodwork flags a kidney problem, the damage has been building for a while. This study reinforces one thing: annual bloodwork (creatinine, SDMA, urinalysis) starting at age 7 is the best early-detection tool we have. “Early” on a blood test is already “late” at the cellular level.
The details
- Combined metabolomics, transcriptomics, and proteomics across kidney regions and CKD stages
- Medullary dysfunction precedes cortical changes
- Energy production fails first, then oxidative damage and fibrosis pathways activate
- SGLT2 (a protein targeted by drugs like Bexacat, already approved for diabetic cats) was downregulated in CKD kidneys
Source: Multi-omics study summarized via MyVetCandy, Jan 7, 2026.
9. Myostatin Isn’t the Early Kidney Biomarker We Hoped For
Researchers tested whether serum myostatin (GDF8) could flag early CKD. In 25 cats across healthy, IRIS stage 1, and IRIS stage 2 groups, myostatin levels showed no significant difference (p=0.608).
What this means for you and your cat
Your vet’s hands-on muscle condition assessment is still more informative than this blood test. Myostatin correlated modestly with muscle condition score, which makes biological sense, but it can’t distinguish early CKD from healthy. Standard monitoring (creatinine, SDMA, urinalysis) remains the way to go.
The details
- 25 cats total (10 healthy, 5 stage 1, 10 stage 2)
- GDF8 measured by ELISA
- Moderate correlation with muscle score (rs=0.517), inverse correlation with age
- No link to creatinine, SDMA, or body weight
Very small groups, single timepoint, pilot study. May simply lack the statistical power to detect a difference, but the signal wasn’t there.
Source: Veterinary Sciences, Jan 15, 2026. DOI: 10.3390/vetsci13010089
10. Cat Infections Have Seasonal Patterns (At Least in Subtropical Cities)
A survey of over 13,000 cats in Shenzhen, China mapped seasonal and demographic risk factors for 11 common infectious diseases. FHV peaked in winter/spring while FIP peaked in summer/autumn.
The details
- 13,134 cats surveyed (Jan 2022–Mar 2024)
- FHV peaked in winter/spring (consistent with respiratory virus behavior)
- FIP coronavirus peaked in summer/autumn (contradicts some prior data)
- Female cats showed distinct susceptibility to feline panleukopenia virus (FPV)
Single subtropical city, hospital-based population. These seasonal patterns may not translate directly to temperate climates. But the dataset is large and the FIP seasonality finding is novel.
Source: PMC12784829, published Dec 2025, indexed Jan 2026.
11. “Aging Is Modifiable” — A New Framework for Thinking About Senior Cats
A multi-author review in JAVMA proposed a formal definition of “healthy aging” in cats and dogs and argued that aging is a modifiable process, not just inevitable decline. They highlighted biological aging clocks (epigenetic markers that could measure a cat’s “true” biological age) as underused tools.
The core idea is worth taking seriously: proactive senior care (diet, enrichment, regular vet visits, managing chronic conditions early) can change the trajectory of aging. That’s not new advice, but framing it as “modifiable” rather than “inevitable” shifts the mindset in a useful direction.
The reality check: no validated commercial aging clock exists for cats yet. And the author list includes researchers affiliated with Royal Canin, Waltham/Mars Petcare, and the Loyal longevity startup, so there are commercial interests in the room. The framework is useful. Don’t let anyone sell you a product based on it.
Source: JAVMA, online Oct 2025, print Feb 2026. DOI: 10.2460/javma.25.06.0412
12. Your Vet Got New Diagnostic Tools This Month
Antech Diagnostics launched two products at VMX 2026 in January:
- RapidRead™ Dental for Feline — an AI tool that analyzes cat dental X-rays tooth-by-tooth and generates annotated reports in under 10 minutes. It’s trained specifically on feline anatomy, which matters because cat dental disease (especially tooth resorption) looks different from dogs and is easy to miss
- SDMA on Element i+ — in-clinic kidney function testing that gives results in about 3 minutes during the appointment, instead of waiting for an outside lab
What this means for you and your cat
Neither changes what you need to do as an owner. But they may mean your vet catches things faster, especially dental disease, which is chronically underdiagnosed in cats. If your cat is due for a dental evaluation or kidney check, the turnaround just got quicker.
These are product launches, not peer-reviewed studies. Performance claims are based on internal testing by a Mars Petcare subsidiary.
Source: Antech Diagnostics press release, Jan 13, 2026.
That’s for January. We’ll be back soon for the February updates. Subscribe to our newsletter to be the first to read our posts.