Three structures decide most of a Highlander's health budget: heart muscle, kneecaps and the ear canal under a curled pinna. The screen that catches all 3 is an echo at 12 months and every 12 months after, a stifle and hip X-ray at 12 months with patella grading at every exam, a cardiac DNA panel once, a urinalysis every 12 months, and otoscopy every 6 months. Sleeping respiratory rate at home, counted for 30 seconds, is the cheapest early warning you have. Published breed evidence is limited, so treat these intervals as a floor drawn from curled-ear and large-frame practice.
Why these 3, and not the whole body
Hypertrophic cardiomyopathy is the one that kills quietly: the heart muscle thickens, the ventricle stiffens, and the cat compensates for months without a murmur loud enough to hear through a curled ear. Patellar luxation in this frame is usually medial, graded 1 to 4, and a grade 1 knee can sit unchanged for 4 years before it becomes a grade 3 with a skip in the gait. The curled pinna narrows the external canal and traps wax, so otitis externa recurs every 3 to 6 months in cats that are never checked. None of these 3 is expensive to monitor and all 3 are expensive to treat late.
Screening schedule by age
| Test | Start (months) | Repeat (months) | USD | CNY |
|---|---|---|---|---|
| Cardiac echo | 12 | 12 | 250-450 | 1,800-3,200 |
| HCM DNA panel | 2 | 0 (once) | 80-150 | 600-1,100 |
| Stifle and hip X-ray | 12 | 12-24 | 130-240 | 900-1,700 |
| Urinalysis and SDMA | 12 | 12 | 50-95 | 350-680 |
| Otoscopy with cytology | 6 | 6 | 40-80 | 300-580 |
| Dental check | 24 | 12 | 90-200 | 650-1,450 |
Read the X-ray row carefully: a single film at 12 months grades the knee once, but patellar luxation progresses, so the repeat at 12 to 24 months is what tells you whether a grade 1 has moved. Ask for 2 views per stifle, craniocaudal and mediolateral, because a mediolateral view alone misses about 1 in 5 medial luxations. Urinalysis plus SDMA at 12 months is the baseline for the kidney numbers you will compare against for the next 10 years.
Patella grades 1 to 4, in plain terms
| Grade | What the vet can do | Typical action | Recheck (months) |
|---|---|---|---|
| 1 | Pushes out, returns alone | Monitor, no surgery | 12 |
| 2 | Pushes out, returns with rotation | Weight control, recheck | 6 |
| 3 | Out most of the time, corrects by hand | Surgical consult | 3 |
| 4 | Out permanently, cannot be replaced | Surgery, 2 to 4 weeks recovery | 1 |
Weight is the lever here. Every 1 kg of body weight above a score of 5 adds roughly 3 to 4 kg of load across the stifles during a jump from 1 m, which is why the first recommendation for a grade 2 knee is not surgery but 8 to 12 weeks of controlled weight loss at 1 to 2 percent of body weight per week.
4 signals visible at home
- Skipping gait for 2 to 3 steps. A hind leg that hitches once or twice then carries on is the classic grade 2 presentation, most obvious on turns or after rest.
- Sleeping respiratory rate above 30. Count breaths for 30 seconds while the cat is asleep and multiply by 2. A rate of 30 or more on 3 separate days, or any rise of 10 over the cat's own baseline, needs an echo.
- Head shaking, ear odor at 20 cm. More than 3 head shakes in an hour, a tilt held for 2 hours, or a smell you notice at arm's length means the narrowed canal is infected, not just waxy.
- Hiding and a lower jump. A cat that stops using a 60 cm shelf it used daily, or hides more than 4 hours a day, is showing pain or breathlessness rather than mood.
Hour-level thresholds: when to stop watching
| Signal | Threshold | See a vet within (hours) |
|---|---|---|
| Open-mouth breathing at rest | 1 minute or more | 0 (now) |
| Sleeping respiratory rate | above 40 breaths per minute | 4 |
| Blue or grey gums | any duration | 0 (now) |
| Hind-leg lameness, no weight bearing | 2 hours | 24 |
| Refusing food | 24 hours | 12 |
| Ear discharge with tilt over 30 degrees | 12 hours | 24 |
The threshold that saves the most money is the sleeping respiratory rate, because it moves the echo forward by weeks rather than by the 12-month interval. Count it at the same time each night, write the number down, and bring 14 days of numbers to the appointment; a trend from 22 to 32 is more useful to a cardiologist than any single reading. The threshold that is most often ignored is lameness: a cat that will not bear weight for 2 hours has either a luxation at grade 3 or worse, or a fracture, and both need a film the same day.
What each test measures
Echo gives wall thickness at end-diastole (6 mm is the working cut-off), left atrium-to-aorta ratio (1.5 or above is enlarged), and Doppler flow across the outflow tract. The stifle film measures the trochlear groove depth and the tibial tuberosity position; the hip film reads coverage of the femoral head. The DNA panel reports known HCM variants and blood group but cannot clear a cat, because a negative panel leaves the non-genetic forms in play. Urinalysis with SDMA catches kidney change 6 to 18 months before creatinine rises.
Cost, and what moves the number
Echo runs 250 to 450 USD (1,800 to 3,200 CNY at 7.1), and the 12-month block of echo, X-ray, urine and DNA lands at 550 to 950 USD (3,900 to 6,800 CNY). Surgery is the line that changes the arithmetic: a patellar repair costs 1,200 to 2,500 USD per knee (8,500 to 18,000 CNY), plus 6 to 8 weeks of restricted activity. An ear flush under sedation at 120 to 200 USD (850 to 1,450 CNY) is the cheaper habit to keep, since 2 flushes a year cost less than 1 surgery and prevent the canal from narrowing further.
The first 12 months, step by step
- Week 8 to 10: HCM DNA panel, blood group, first exam with patella palpation recorded as a number, not a word.
- Month 4: start weighing every 2 weeks and log body condition score on the 1 to 9 scale.
- Month 6: first otoscopy with cytology; begin a 7-day ear check at home, since a curled pinna hides wax.
- Month 12: echo, stifle and hip X-ray with 2 views per joint, urinalysis with SDMA. Photograph the gait on video for later comparison.
- Month 12 to 24: repeat the stifle film if any grade was recorded; set the annual echo reminder and the 6-month ear reminder.
Budget 650 to 1,100 USD (4,600 to 7,800 CNY) for year 1 with nothing found. The related screens at /health/breed-turkish-van-health-screen/ and /health/breed-tonkinese-health-screen/ use the same echo intervals with different ear and skin routines, and /tools/breed-quiz/ helps confirm which line a kitten comes from before you commit to a 12-year screening plan.
Terms mentioned in this article
Frequently asked
At what age should a Highlander first have an echo, and can a murmur be trusted?
Twelve months is the usual first echo, with a repeat every 12 months after that. A murmur cannot be trusted on its own in this breed: the curled pinna and the small chest make auscultation unreliable, and many cats with measurable wall thickening have no murmur at all. The sleeping respiratory rate, counted at home for 30 seconds and multiplied by 2, is a better trigger for moving the echo forward than any single listen.
Is a grade 1 patella something to worry about, or just a note on the chart?
A grade 1 knee is a note plus a plan, not a surgery. The kneecap can be pushed out but returns on its own, and most grade 1 knees stay that way for years. What matters is that the number is recorded and rechecked at 12 months, because progression to grade 2 and 3 is what changes the decision. Keeping body condition at 5 out of 9 is the single measure shown to slow that progression.
How do I tell ear wax from an ear infection in a curled-ear cat?
Wax is brown, odorless at arm's length and comes away on a cotton pad in 2 or 3 wipes. Infection smells at 20 cm, often has a black or yellow discharge, and comes with more than 3 head shakes in an hour or a tilt held for 2 hours. Cytology at the clinic answers it in 10 minutes, and a narrowed canal should never be flushed at home with a pointed nozzle.