Vomiting in Cats Over 10: Frequency, B12, 8 Week Trial

A cat that vomits once a month for 3 years does not have a sensitive stomach; it has a chart entry that was never written down. In a cat over 10, more than 1 vomit per month is the threshold most internists call abnormal, and more than 1 hairball every 2 weeks is not normal either. The workup is cheap and ordered: a weight trend, a chemistry panel with T4, cobalamin and TLI, then an 8 week diet trial. Skipping to a hairball paste and hoping costs 6 months of muscle mass.

The frequency bands

Count episodes, not heaves. Each event where food, foam, or hair leaves the mouth is 1 episode; 10 dry heaves count as 1. Log the time, the content, and whether it was within 60 minutes of eating. Four weeks of that log is more useful than any description given at the desk.

Episodes per month	Reading	Most likely	Act within	Next step
0 to 1	Normal range	Nothing, or a single dietary upset	30 days	Keep logging
2 to 4	Abnormal for age	Hair, IBD, early CKD, hyperthyroid	14 days	Bloodwork with T4
5 to 9	Frequent	Chronic enteropathy, partial obstruction	7 days	Examination plus ultrasound
10 or more	Severe	Obstruction, pancreatitis, toxin	0 days	Same day visit

Any episode with blood, any 24 hour window with 3 or more, and any cat that cannot keep water down for 12 hours skips the log and goes to a clinic.

Hairball or something else

A true hairball is a compact cylinder of hair, brought up without food, usually after grooming, and rarely more than once every 2 weeks in a healthy short haired cat. Chronic enteropathy looks different in 3 ways: the vomit contains digested food 2 or more hours after a meal, it happens at 4 to 6 am as often as after eating, and the cat is losing weight while eating well. Hair in the vomit does not rule out disease; a cat with gut inflammation grooms more and swallows more hair, which is why hairball paste treats the symptom and hides the cause.

Bloodwork, B12, and TLI

The first panel is a CBC, a chemistry profile, a T4, and cobalamin with folate. Roughly 1 in 3 cats with chronic enteropathy has low cobalamin, and a result under the lab reference interval, often near 250 to 300 ng/L at the bottom end, means the ileum is not absorbing and monthly injections are needed. High folate with low cobalamin points to small intestinal bacterial overgrowth. Add a feline TLI once: a value under 8 µg/L means exocrine pancreatic insufficiency, which is rare but treatable with enzyme powder and explains 1 to 2 vomits a week plus 10 percent weight loss. Fast the cat 8 to 12 hours before the draw.

The 8 week diet trial

Pick 1 hydrolyzed protein or 1 novel protein diet and change nothing else for 8 weeks. Transition over 7 to 10 days, mixing 25 percent new food at day 1, 50 percent at day 4, 75 percent at day 7, then 100 percent. During the 8 weeks: no treats, no table food, no dental chews, no flavored medication, no food from a second cat's bowl, and no outdoor hunting. A single lapse of 3 days resets the clock. Keep the log going; the target is 0 episodes in weeks 7 and 8.

If the cat is better at week 8, challenge with the old food for 4 weeks. Relapse within 3 to 10 days confirms food responsive disease and gives a diet you can keep. If nothing changes, the trial has still earned its cost: it removes diet from the list and points to ultrasound and biopsy.

Weight, hydration, and muscle

Weigh weekly on the same scale, and record it on the weight trend sheet. A 5 percent loss in 6 months with normal appetite is a red flag for enteropathy or hyperthyroidism; 10 percent or more means the workup should not wait for the diet trial to finish. Check hydration at the scruff and the gums, and ask about daily water intake: a cat eating 200 g of wet food takes 150 to 160 mL from food alone, while a dry food cat may need 200 to 250 mL of drinking water and usually does not get it.

Red flags that skip the trial

Go directly to imaging if the cat vomits 3 or more times in 24 hours, has blood in the vomit or stool, shows abdominal pain when lifted under the belly, stops eating for 24 hours, or has lost 10 percent of body weight. A palpable mass, jaundice, or a fever above 39.5 Celsius moves the timeline from weeks to hours. In a cat over 12, 1 vomit a week plus weight loss deserves an ultrasound early, because lymphoma and adenocarcinoma both present that way and both are easier to stage at 1 month than at 4.

If the trial fails

Next is an abdominal ultrasound, then endoscopy with biopsies, or a surgical biopsy if the changes are in the jejunum. Ask for a cobalamin recheck at 8 weeks, a repeat T4 if the first was above 30 nmol/L, and a blood pressure reading, since hypertension and gut disease travel together in old cats. Cats with low B12 need injections every 7 days for 6 weeks, then every 4 weeks, and the level should be rechecked at 3 months.

Five steps for this month

• Start a 4 week log with time, content, and minutes after eating.
• Weigh the cat today, and photograph the scale reading.
• Book bloodwork with T4, cobalamin, folate, and TLI, fasting 8 to 12 hours.
• Choose 1 trial diet and buy 8 weeks of it before day 1, so a gap cannot break the run.
• Estimate the total with the cost calculator; a workup plus 8 weeks of hydrolyzed food is usually the cheapest path compared with 6 months of guessing.

Two other changes are easy to miss in the same cat: night yowling and bumping into furniture point to the checks in vision loss in senior cats, and both are worth doing at the same visit as the gut workup.

Terms mentioned in this article

T4CKDIBD

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