A cat that brings food back after every meal for 3 days is losing more than it looks: each episode can take 20 to 40 ml of fluid with it, and a 4 kg cat that drops 200 g has crossed the 5% line where dehydration and muscle loss start to matter. Vomiting within 15 minutes of eating points at a mechanical problem in the esophagus or stomach, while vomiting 4 to 8 hours later points at the small bowel, and the timing is the single most useful thing you can write down.
Time the vomit, not the volume
| Minutes after the meal | What comes up | Most likely group | One thing to do | Urgency |
|---|---|---|---|---|
| 0-15 | Almost intact kibble, tube-shaped | Esophagus, or eating too fast | Feed 10-15 g at a time | Low for 1-2 days |
| 15-60 | Softened food plus foam | Stomach, gastritis | Split into 5-6 meals | 48 hours if daily |
| 1-4 h | Partly digested, sour smell | Stomach or motility | Raise the bowl 10 cm | 48 hours |
| 4-12 h | Liquid, bile-tinged, hair | Small bowel | Weigh and book | 24-48 hours |
Two details change the reading. First, hair: a 3 to 5 cm hair plug in the vomit means part of the load is grooming, not disease. Second, posture: vomiting with the head up and the neck stretched is stomach; bringing food up with a cough, a swallow, or a head-down retch is esophagus, and that pattern is covered in gagging without vomit.
Three causes behind meal-after-meal vomiting
1. Eating too fast, food intolerance, or hair. The commonest by a wide margin. A cat that finishes 60 g in under 2 minutes swallows air with the food, the stomach stretches past its comfort volume, and the meal returns within 10 to 15 minutes, often still shaped like the kibble. A sudden switch to a new protein, or more than 10% of calories changed in 1 day, adds a second trigger.
2. Structural or motility disease of the upper tract. Esophageal stricture, megaesophagus, hiatal hernia, pyloric narrowing, and gastric paresis all cause food to sit or come back. Clues are regurgitation of 2 to 4 hours of undigested food, a swallow that looks effortful, a gurgling chest after drinking, or a cat that loses weight while eating normally.
3. Systemic disease. Chronic kidney disease, hyperthyroidism, inflammatory bowel disease, pancreatitis, and a foreign body all produce vomiting, and each has a different timeline. A cat over 10 years old that vomits 2 to 3 times a week for a month with a rising thirst is a kidney or thyroid case until bloodwork says otherwise.
The 5% weight line, in grams
Weigh the cat on the same scale, at the same time of day, before feeding, every 3 days. A drop of 5% from the starting weight in 7 to 14 days is the line where a visit stops being optional. A drop of 10% means the cat has lost both fat and muscle and needs bloodwork plus imaging.
| Starting weight | 5% loss | Action at 5% | 10% loss | Daily food to hold weight |
|---|---|---|---|---|
| 3.0 kg | 150 g | Book within 48 hours | 300 g | 150-180 g wet |
| 4.0 kg | 200 g | Book within 48 hours | 400 g | 200-240 g wet |
| 5.0 kg | 250 g | Book within 24 hours | 500 g | 250-300 g wet |
| 6.0 kg | 300 g | Book within 24 hours | 600 g | 300-360 g wet |
| 7.0 kg | 350 g | Book within 24 hours | 700 g | 350-420 g wet |
Use a kitchen scale for the cat and a separate bowl, and keep a written number each time. Guessing weight by lifting is off by 300 to 500 g in most households, which is the whole margin you are trying to detect.
Dehydration in 4 checks, scored 0 to 2
Check 1: lift the skin between the shoulder blades and time the return, since under 1 second is normal, 1 to 2 seconds is mild, and over 2 seconds is significant. Check 2: press a finger on the gum above the canine and count the color return, where under 2 seconds is normal and over 2 seconds is a concern. Check 3: look at the gums, since tacky rather than slick means 5% or more fluid loss. Check 4: count urine clumps in 24 hours, where 2 to 4 is normal, 1 is low, and 0 for 12 hours is urgent. Add the scores: 0 to 1 is home care, 2 to 3 needs a call today, and 4 or more needs a visit now. A PCV above 45% or a urine specific gravity above 1.060 at the clinic confirms it.
Four records that change the plan
Record 1: every vomit with time, minutes after the meal, volume in milliliters, and whether food was recognizable. Record 2: meal size in grams and number of meals per day. Record 3: weight every 3 days, in grams. Record 4: water intake and urine clumps per day. Four days of those 4 columns will show whether the pattern is 1 meal a day, 1 fast eater, or a cat that is fading, and the difference decides whether the fix is a slow feeder or a blood panel.
What to change in the next 24 hours
Split the daily ration into 5 or 6 meals of 15 to 25 g, and put the food on a flat plate rather than a deep bowl so the cat cannot take a 4 cm mouthful. Raise the bowl 10 cm for a cat that regurgitates, keep the cat out of the food for 30 minutes after a meal to break the eat-vomit-eat cycle, and stop all treats and milk for 48 hours. Brush the coat for 5 minutes a day during a shed to cut hair intake. Do not start any anti-vomiting drug, antacid, or probiotic without a prescription, and never give a human anti-nausea tablet, since several are toxic to cats. If the cat chewed a plant, string, or human food in the past 72 hours, check the toxicology tool first.
Vomiting that is not vomiting
A cough that ends in a swallow, especially after drinking, is often mistaken for vomiting and points at the airway; that pattern is described in coughing after drinking. A cat that retches on an empty stomach at 4 to 6 am and brings up foam has a different problem from one that vomits right after eating, and the two need different tests.
The vet line: 5 findings that mean today
Go today for blood in the vomit, vomiting 3 or more times in 24 hours, a 5% weight loss in 7 days, a score of 4 or more on the dehydration checks, or a cat that is hiding and not grooming. Expect a physical exam, a blood panel with kidney and thyroid values, and an X-ray or ultrasound; an endoscopy is the next step if the esophagus is suspected.
Five steps for tonight
- Write the clock time of the next vomit and the minutes since the meal.
- Weigh the cat before feeding and write the grams, not the kilos alone.
- Split tomorrow into 5 meals of 15 to 25 g on a flat plate.
- Run the 4 dehydration checks and add the score.
- Photograph the vomit next to a ruler if hair or a foreign body is present.
Terms mentioned in this article
Frequently asked
Why does my cat vomit right after eating but seem fine after?
Vomiting within 10 to 15 minutes of a meal, with food that still looks like kibble, is usually mechanical: the cat ate 60 g in under 2 minutes, swallowed air, and overfilled the stomach. Splitting the ration into 5 or 6 meals of 15 to 25 g on a flat plate fixes most of these cases within 3 to 5 days. If it continues past a week, or the cat starts losing 5% of body weight, the esophagus and stomach need imaging.
How much weight loss is serious?
Five percent of body weight in 7 to 14 days is the line where a visit stops being optional, and 10% means the cat has lost fat and muscle and needs bloodwork plus imaging. For a 4 kg cat, 5% is only 200 g, which is why a kitchen scale every 3 days matters more than how the cat looks. Vomiting 3 or more times in 24 hours is a reason to go sooner than any weight number.
How do I check for dehydration at home?
Use 4 checks scored 0 to 2 each: skin tent return under 1 second, gum color return under 2 seconds, gums slick rather than tacky, and 2 to 4 urine clumps in 24 hours. A total of 0 to 1 supports home care, 2 to 3 needs a call today, and 4 or more needs a visit now. A clinic can confirm with PCV above 45% or urine specific gravity above 1.060.