An American Shorthair needs 4 things checked on a clock, not on symptoms: the heart muscle from 12 months, the hip joints once at 24 months, the mouth every 6 to 12 months, and the scale every 30 days. The order matters because the first 3 are silent for years, and the fourth, body weight, is the only 1 you can measure at home.
4 targets, and why each one hides
Hypertrophic cardiomyopathy (HCM) thickens the heart wall without a pressure load to explain it, and a cat can carry a 7 mm wall with a quiet chest. Hip dysplasia means a loose, shallow joint that remodels with age; a cat hides it by jumping less, not by limping. Dental disease starts as gingivitis at the gumline, which is reversible, and ends as attachment loss, which is not. Obesity is the multiplier: it raises anesthetic risk, worsens joint load, and makes every image harder to read.
6 months to 2 years: set the baselines
At 6 months, weigh and score body condition on the 9-point scale, target 5 out of 9. Ask for a first dental look at the same visit, because retained deciduous teeth and a malocclusion are cheapest to fix before 12 months. At 12 months, book the baseline echocardiogram and a cheek swab for the cardiac panel. Between 12 and 24 months, weigh monthly. A cat that gains 300 g in 8 weeks on free feeding is not growing, it is overfed; cut the ration by 10 percent and reweigh in 30 days.
2 to 7 years: the 12-month beat
One echo every 12 months, one urinalysis every 12 months, one dental examination every 6 to 12 months, and a weigh-in every 30 days. The echo compares wall thickness against the 12-month baseline: under 5 mm is normal, 5 to 5.9 mm earns a recheck in 6 months, and 6 mm or more meets the usual definition. The left atrium to aorta ratio should stay at 1.5 or below; above 1.7 means the plan changes this week, not next year. Urinalysis looks at specific gravity 1.035 to 1.060, protein to creatinine under 0.2, and SDMA at or below 14 micrograms per deciliter.
The schedule on 1 page
| Age band | Echo | Hip films | Urinalysis | Dental exams |
|---|---|---|---|---|
| 6 to 12 months | 0 | 0 | 0 | 1 |
| 12 to 24 months | 1 | 1 | 1 | 2 |
| 2 to 7 years | 1 per 12 months | 0 | 1 per 12 months | 1 to 2 per 12 months |
| 7 to 10 years | 1 per 12 months | 0 | 1 per 12 months | 2 per 12 months |
| 10 years and up | 1 per 12 months | 0 | 1 per 6 months | 2 per 12 months |
Two rows carry the decisions: the 12-to-24-month row sets the hip and heart baselines, and the 10-plus row halves the urine interval, because kidney function can move 1 stage in under 12 months.
Hips: 1 film at 24 months, 2 views
Hip dysplasia is a developmental problem, so the film waits until the growth plates close at about 22 to 26 months; an earlier film can look normal and still miss a lax joint that remodels later. The set is 2 views, extended and frog-leg, under light sedation, 150 to 350 dollars. The report gives a Norberg angle, the coverage of the femoral head by the acetabulum: 105 degrees or more is generally read as acceptable, under 105 degrees suggests laxity. Grades run from normal to mild, moderate, and severe. Mild means no stairs after 7 p.m., a ramp to the bed, and 30-day weigh-ins; moderate to severe means a orthopedic consult, and possibly a femoral head excision at 800 to 2500 dollars if pain does not respond to a non-steroidal anti-inflammatory class by veterinary prescription.
Mouth: stage it, do not wait for bad breath
Cats hide oral pain: a 4 mm pocket means eating on the other side, not crying. Staging at every examination is the only way to catch it before extraction. Stage 0 is a clean gumline; stage 1 is redness at the margin with no attachment loss; stage 2 is under 25 percent attachment loss; stage 3 is 25 to 50 percent; stage 4 is over 50 percent, with mobile teeth. A normal sulcus probes at 1 mm or less, so anything over 1 mm gets charted and rechecked in 6 months. A full cleaning with radiographs under anesthesia runs 300 to 700 dollars; an extraction adds 40 to 150 per tooth, and a fractured canine that needs a specialist can run 800 to 1500. Brushing 3 times a week with a pet enzyme paste is the only home step with a measurable effect.
Weight: the 5 percent rule
Weigh on the same scale, every 30 days. A change of 5 percent in 30 days, or 10 percent in 6 months, is a vet call, not a diet adjustment. For a 5 kg cat, 5 percent is 250 g. Free-fed cats drift upward by roughly 100 g a month on a diet that is 10 percent over their energy need; over 2 years that is 2.4 kg, which is a second cat on the same frame. Measure the kibble with a cup, not a scoop, and recheck the bag calorie density, because 2 brands can differ by 80 kcal per 100 g.
4 things to watch, in order of cost
- Sleeping respiratory rate above 30 breaths per minute, counted twice a week for 30 seconds.
- Jumping onto a counter it used to clear, or a new hesitation of more than 3 seconds before a jump.
- Eating on 1 side, dropping kibble, or flinching when the muzzle is touched.
- Weight up 5 percent in 30 days, or ribs that need pressure to feel.
Deadlines by the hour
| Deadline (hours) | Signal | Action |
|---|---|---|
| 0 | Open-mouth breathing, blue gums, collapse | Emergency room now |
| 0 | Sudden hind leg paralysis, cold pads | Clot until proven otherwise |
| 1 | Resting rate 40 or more per minute | Call, arrive within the hour |
| 2 | No food for 24 hours, or 12 hours of straining with no urine | Emergency line |
| 4 | Mouth bleeding that lasts 10 minutes | Same-day clinic |
| 72 | New bad breath plus drooling for 48 hours | Book within 3 days |
What the year costs
Exam 60 to 120, bloodwork 80 to 200, echo 220 to 450, urinalysis 40 to 90, blood pressure 20 to 60, hip films 150 to 350 once, dental cleaning 300 to 700 every 2 to 3 years, and a cardiac panel 80 to 200 once. A routine year is 400 to 800 dollars; a year with a dental and an echo is 800 to 1400. Insurance quotes 20 to 40 dollars a month for this profile, and dental illness is often a rider, so read the exclusion list before the first cleaning, not after.
5 steps for this month
- Put a 20-dollar baby scale in the bathroom and weigh the cat on the 1st of each month.
- Book the 12-month echo and the cheek swab in the same appointment.
- Open the mouth once a week and look at the gumline where the tooth meets gum.
- Set a 24-month reminder for hip films, because that window closes quietly.
- Write the sleeping respiratory rate on the same card as the weight, and chart both monthly.
If the eyes look wrong at the same time as the mouth, the breed has a separate eye protocol at the eye screen. And before any human dental rinse or pain tablet goes near the cat, check the toxin list: paracetamol and most human mouthwashes are not safe in a cat.
Terms mentioned in this article
Frequently asked
Why wait until 24 months for hip radiographs?
Because the growth plates are still open before roughly 22 months, and an early film can look normal while a loose joint remodels into dysplasia later. One set at 24 months, 2 views, under light sedation, gives the Norberg angle you will compare against for the rest of the cat life. If the angle is under 105 degrees, the plan changes to ramps, weight control, and a recheck, not surgery on day one.
How often should an American Shorthair have an echocardiogram?
One at 12 months as a baseline, then every 12 months for life, with blood pressure added after age 7. The baseline matters because HCM is judged as a change: 5 mm at age 3 means something different from 5 mm at age 1. A murmur is an unreliable filter, since a cat with a 7 mm wall can have a quiet chest, so a normal stethoscope exam does not cancel the scan.
What is the 5 percent weight rule?
Weigh the cat every 30 days on the same scale, and treat a 5 percent change in 30 days, or 10 percent in 6 months, as a reason to call the vet rather than adjust food alone. For a 5 kg cat, 5 percent is 250 g. Free-fed cats drift about 100 g a month on a diet that runs 10 percent over energy need, which becomes 2.4 kg in 2 years and changes anesthetic and joint risk.