Aspiration pneumonia shows up 6 to 12 hours after the vomit, not during it. A cat that vomits once, coughs for 20 seconds and then asks for food is usually fine. A cat that vomits while lying flat, comes up with a wet rattle, or has 2 or more episodes inside 1 hour needs its breathing counted every 30 minutes for the next 12 hours. Three numbers decide the trip to the clinic: resting respiratory rate over 40 per minute, temperature over 39.5 C, and gum colour that stays pale past 2 seconds of refill.
The first 10 minutes at home
Keep the head level with the hips or 15 degrees below for the first 10 minutes after the episode, so gravity pulls fluid out of the airway instead of into the right middle lung lobe. Wipe the mouth with a 10 cm gauze square and let the cat swallow; do not syringe water, because 2 to 5 mL pushed into a cat that is still retching can go straight down the trachea. No food for 2 hours and no water for 30 minutes. Then count breaths.
Do not hold the cat upside down or squeeze the chest. Both push stomach contents back up the esophagus, and a cat hung head-down for 20 to 30 seconds is more likely to inhale at the next cough, not less.
Count breaths the way a clinic does
Count at rest, ideally asleep, for 30 seconds, then multiply by 2. Two counts 10 minutes apart give a better picture than one. Normal is 20 to 30 per minute. A count of 30 to 40 is a watch value: recheck in 30 minutes and write both numbers down. A count above 40 at rest, with no play and no heat, is the threshold most vets use for a same-day visit. Above 60, or any open-mouth breathing, is an emergency now — cats do not pant to cool down the way dogs do.
The cut-offs, plus a photo for the file
| Check | Normal | Call clinic at | Drive in at |
|---|---|---|---|
| Breaths at rest | 20-30 /min | 40 /min | 60 /min |
| Temperature | 38.1-39.2 C | 39.5 C | 40.5 C |
| Gum refill | 1-2 s | 2 s | 4 s |
| Food intake | eats by 12 h | 12 h none | 24 h none |
| Weight | 0 g change | 200 g down | 400 g down |
Blue or grey gums is a drive-in sign whatever the numbers say, and so is a cat that will not lie down. Photograph the gums in daylight with the flash off, and take a 10-second video of the cat breathing; that clip is enough for a vet to count rate and judge effort.
Why the X-ray window is 24 hours
A film taken at 4 to 6 hours can look clean in a cat that is already sick, because the inflammatory pattern takes time to fill the lobe. The classic window is 12 to 24 hours, and the right middle lobe is the usual site, which is why vets ask for a right lateral and a ventrodorsal view rather than one shot. A cat with a normal film at 18 hours and a stable breathing rate can usually be sent home with a recheck at 48 hours. A cat with a 2 cm alveolar pattern and a rate of 44 stays.
Antibiotics for 7 to 14 days
Treatment is 7 days for a mild case with 1 lobe involved and no fever, and 10 to 14 days for fever, 2 lobes, or a cat that needed oxygen. Amoxicillin-clavulanate at 12.5 to 25 mg per kg twice daily is a common first choice, and metronidazole or clindamycin is added when the vomit was fecal or the cat has dental disease. Stopping at day 3 because the cat looks better is the most common reason for a relapse inside 3 to 5 days, and the second course usually runs longer than the first.
Do not use leftover human antibiotics. A 500 mg amoxicillin capsule split for a 4 kg cat is guesswork at the 10 percent level, and doxycycline from an old bottle loses potency and can cause esophageal stricture in cats if a dry tablet sticks — 6 mL of water or food after the tablet prevents that.
The first 48 hours in hospital
Oxygen is run at 40 to 60 percent in a cage or by mask, nebulized saline goes for 10 to 15 minutes every 8 hours, and chest coupage follows each session for 5 minutes with the cat lying on the affected side. Fluids run at 2 to 3 mL/kg/h. A cat that needs more than 60 percent oxygen, or that keeps a rate above 50 after 6 hours of treatment, is a candidate for a feeding tube and a longer stay, and the vet will usually repeat the film at 48 to 72 hours before stopping antibiotics.
Which cats carry the highest risk
Any cat that vomits while under sedation or anesthesia, a cat fed by tube at more than 20 mL per feed, a cat with megaesophagus or a hiatal hernia, and a kitten under 12 weeks with a 1 mL stomach. Brachycephalic cats and cats with obesity have less reserve: a 6 kg cat with a 30 percent body fat load desaturates faster than a 4 kg cat on the same lobe volume. Hairballs vomited 3 or more times a week are also worth a vet visit, not just a laxative — and if the vomit followed a plant or a human medicine, check the item against the toxic plant and food list before you drive.
When to drive in now
Open-mouth breathing, a rate over 60, blue or grey gums, a temperature over 40.5 C or under 37.0 C, collapse, or a cat that will not lie down and keeps its neck stretched forward. Also drive in if the cat vomited again after the first episode and the rate climbed by 10 or more in 30 minutes. On the way, keep the carrier flat, the car at 20 to 22 C, and the cat's head slightly up; call ahead so oxygen is ready when you arrive, which saves 5 to 10 minutes on a night when minutes matter.
A 15-minute exam that records weight, breathing rate and temperature gives you the baseline to compare against tonight, the same checks covered in the first vet visit after adoption. If the cat is also digging in the litter box or straining, treat that as a separate problem rather than a sign of pneumonia; litter box digging after use covers the common causes.
Tonight, in order
- Head level or 15 degrees down for 10 minutes, mouth wiped with gauze, nothing by mouth for 30 minutes.
- Count breaths twice, 10 minutes apart, asleep, 30 seconds each, and write both numbers with the time.
- Take the temperature at 2, 6 and 12 hours if the cat tolerates a rectal thermometer; stop if it fights.
- Book the film for 12 to 24 hours after the episode, not 3 days later.
- Give the full 7 to 14 days of antibiotics and book the 48-hour recheck before you leave the clinic.
Frequently asked
How do I know if my cat aspirated vomit?
You cannot see it happen, so you count instead. Within 6 to 12 hours a cat that aspirated usually breathes faster than 40 per minute at rest, runs a temperature above 39.5 C, sounds wet when it purrs or breathes, and may stop eating. A single cough right after vomiting with a normal rate at 2 hours is not enough evidence. The film at 12 to 24 hours is what confirms it, and the right middle lobe is the usual site.
Can I wait until morning to see the vet?
Only if the resting rate stays under 40 per minute, the temperature is under 39.5 C, the gums are pink with a refill under 2 seconds, and the cat is still drinking. Recheck every 30 minutes and write the numbers down, because a rate that climbs from 32 to 46 in 2 hours is a reason to go in that night. Open-mouth breathing, blue gums, or a rate above 60 means go now, whatever the hour.
Why does the antibiotic course run 7 to 14 days?
The length matches how much lung is involved and whether the cat had a fever. One lobe with no fever usually clears on 7 days, while 2 lobes, a fever, or a cat that needed oxygen gets 10 to 14 days. Stopping at day 3 when the cat starts eating again is the usual cause of a relapse within 3 to 5 days, and the second course is longer and often needs a different drug.