Resting Breathing Rate in Old Cats: The 30 Count

A resting breathing rate is the cheapest test in senior cat care and the one most often skipped. Under 30 breaths per minute while asleep is normal, 30 to 39 is a recheck, and 40 or more is a reason to go to a clinic the same day. You can measure it in 30 seconds, twice, with a phone timer, and 3 records a month turn a single number into a trend. Cats with heart disease often show a rising rate 2 to 6 weeks before they look sick.

30 seconds, 2 counts, 1 number

Wait until the cat is asleep or in a deep doze, not resting after play. Watch the rib cage, not the belly, and count each rise as 1. Run a 30 second timer, count, multiply by 2, then repeat once and take the higher of the 2 counts. If the 2 counts differ by more than 6, wait 10 minutes and do it again. Write the number and the time of day; a rate taken at 3 pm in July is not comparable with one taken at 3 am in January.

Why rate and not effort

Effort is what everyone looks at and it is the last thing to change. A cat can pull hard at 28 breaths per minute for weeks and a cat at 44 can look calm in the carrier. Rate is numeric, repeatable, and available at 11 pm on a Sunday. It is also the measurement that catches pleural fluid, pulmonary edema, and a worsening heart murmur while the cat is still eating, which is the window where treatment is cheap.

How to count without waking the cat

Dim the room, put the phone face down on the floor, and watch from 1 meter so your shadow does not land on the cat. Do not count a purring cat: purr vibration moves the rib cage at 25 to 30 cycles per second and destroys the count. Do not count while the cat is sniffing, yawning, or just settling. If the cat wakes, stop and try again after 15 minutes; a half asleep count is worse than no count.

The 4 bands and what each one means

Breaths per minute	Band	What it suggests	Recheck within	Action
16 to 24	Normal sleep rate	No load	30 days	Next scheduled record
25 to 29	Upper normal	Watch the trend	72 hours	Record again on day 3
30 to 39	Elevated	Pain, fever, stress, early fluid	24 hours	Recount, then call the vet
40 to 59	High	Edema, effusion, asthma, anemia	2 hours	Same day clinic visit
60 or more	Emergency	Respiratory failure risk	0 hours	Emergency room now

A single reading of 32 in a hot room is not an emergency. A reading of 32 that was 22 last month, with the cat sleeping in the same spot at the same hour, is worth a call the same week.

3 records a month, 1 sheet, 12 months

Pick 3 fixed slots: 1 morning, 1 evening, 1 weekend, on days 1, 10 and 20 of the month. That gives 36 numbers a year on 1 page, which is enough to see a 4 breath drift. Mark the sleep location and the room temperature next to each entry, because a cat that moves from a cool floor to a radiator ledge will read 4 to 6 breaths higher for reasons that have nothing to do with disease. Bring the sheet to every visit; a 12 month trace changes the conversation from how is she to what is this slope.

What falsely raises the number

Heat above 26 Celsius, a closed room, pain, a full bladder, a recent meal, and 15 minutes of play can each add 5 to 8 breaths and settle within 30 minutes. Purring adds a false 10 or more. Anxiety from a house guest, a new puppy, or a move can hold a cat at 32 to 36 for 3 days. Strip those out before treating a number as a finding: 3 consecutive elevated records at the same hour in the same room is the signal.

Rate is not the only alarm

Go now regardless of rate if the cat is open mouth breathing, has blue or grey gums, sits with the neck extended and elbows out, or will not lie down. Those 4 signs mean the cat is working to breathe and the rate can still look acceptable at 36 because the tidal volume has dropped. A cat that coughs 2 or more times a day, or that has fainted once, needs an examination with chest radiographs and an echocardiogram, not another month of counting.

Heart, thyroid, or lung

In a cat over 10, a rising rate at rest is a heart question as often as a lung question. Hypertrophic cardiomyopathy and pleural effusion both raise the rate before they raise the alarm, and untreated hyperthyroidism lifts the resting rate by 10 to 20 breaths and hides the change inside the normal band. That is why the trace belongs beside thyroid numbers: the hyperthyroid baseline sheet and this one should live on the same fridge door, and a cat whose T4 is high should be counted 3 times a week until it is controlled.

Five steps for this month

• Do 2 counts of 30 seconds tonight, and write both, not just the average.
• Fix the 3 monthly slots in a phone reminder with the room and the hour.
• Note the sleep spot and the room temperature beside every entry.
• Weigh the cat the same day, and log it on the weight trend sheet, since fluid gain shows up as 200 to 400 g first.
• Photograph the sheet monthly, and budget the workup with the cost calculator before an emergency makes the decision for you.

Owners who track the rate for 3 months usually catch the first bad week earlier than an annual examination can, and arrive with 36 numbers instead of a feeling.

Terms mentioned in this article

T4

Frequently asked