Breathing is judged fairly only at rest, because a cat who has just played, travelled or been handled breathes fast for innocent reasons. The skill to build is twofold: know her normal resting pattern well enough to spot a change, and recognise the signs of effort that turn an observation into an emergency. Cats mask illness skilfully, and breathing changes are often a clear signal they cannot hide.
Count her true resting rate
Choose a moment when she is asleep or dozing in a familiar spot, ideally before she notices you watching, since attention and approach can quicken her breathing. Watch the rise and fall of her flank or chest: one rise plus one fall counts as one breath. Count for a full 60 seconds rather than sampling 15 seconds and multiplying, because resting breathing can be uneven. A resting cat typically breathes around 20 to 30 times a minute, with a smooth, regular rhythm. Repeat the count on a few ordinary days and write down her usual figure; a personal normal is far more useful than a textbook range when you are worried at 2 a.m. Note also what normal looks like for her: barely visible movement, closed mouth, relaxed posture, no sound.
Recognise abnormal patterns at rest
A rate that stays persistently above her usual, creeping upward across an evening or remaining high across repeated counts, deserves attention even before other signs appear. Effort matters more than speed alone: watch for the belly pushing visibly with each breath, the chest heaving, the head and neck stretched forward, elbows held away from the body, nostrils flaring with each intake, or a cat who keeps shifting and cannot settle into sleep. Sound is information too: wheezing, crackling, snoring that is new, or any breathing you can hear across a quiet room is abnormal at rest. Open-mouth breathing and panting in a resting cat are never a wait-and-see sign; unlike dogs, cats do not pant to cool down under ordinary indoor conditions.
The emergency line
Treat laboured breathing, open-mouth breathing, gasping, a blue or pale tinge to the gums, collapse, or frantic restlessness with inability to lie down as an emergency requiring a vet now, not in the morning. Phone ahead while you prepare to leave so the clinic can be ready. Keep everything low-stress on the way: place her gently in a carrier, cover it to darken the interior, skip any examination or attempt to look inside her mouth, and drive smoothly. Stress and restraint consume oxygen a struggling cat cannot spare, so a calm journey matters medically as well. If she worsens during the drive, phone the clinic from the car if a passenger can call, or on arrival, and say clearly that a cat in respiratory distress is coming in.
Report observations the vet can use
When you call, give facts in a useful order: her resting rate as counted, how long breathing has looked abnormal, whether effort, noise or open-mouth breathing is present, whether she has eaten, and any recent injury, fall or known heart or chest history. A short phone video of her breathing at rest, taken without disturbing her, helps the vet judge urgency before you travel and is worth the few seconds it takes. Avoid describing a diagnosis you suspect; the observed signs, accurately reported, guide the clinic far better.
Build the baseline habit
Recheck her resting rate monthly on an ordinary evening, and after any illness at the interval the vet suggests, so changes surface early rather than during a crisis. Keep counts in dated order; a slow climb from the low twenties toward the mid thirties across months is a pattern a single reading would never reveal, and it is exactly the pattern worth raising at a routine appointment. Presented with months of counts, any clinician can spot drift instantly thanks to the log filed in KinsLe's Pet Passport.