Why cod liver oil hits small cats harder
That single capsule contained enough vitamin A to meet your 3 kg cat’s needs for over a week, concentrated in an oily form that irritates intestinal linings. Unlike dogs, cats lack efficient pathways to excrete excess vitamin A, so even modest overdoses accumulate faster. Diarrhea is her body’s emergency attempt to limit absorption.
Check stools for oily sheen or orange tint — these confirm the capsule ruptured fully. Foamy vomit or gagging suggests some oil refluxed into the esophagus, which increases aspiration risk. Wipe her paws and chin gently with a damp cloth to remove residual oil she might groom off later.
Sensitive stomachs amplify the reaction
Existing digestive issues mean her intestinal villi are already compromised, making nutrient absorption erratic. The oil’s sudden influx overwhelms her gut’s ability to process it smoothly, causing spasms and watery stools. This differs from food intolerance diarrhea by its sudden onset and lack of undigested food particles.
Withhold all food for 4-6 hours to let her gut rest, then offer a teaspoon of plain boiled chicken (no skin or fat) every two hours. Avoid dairy or fiber supplements that could further disrupt absorption. If diarrhea persists beyond 12 hours, dehydration becomes a real risk for her small body weight.
When diarrhea signals something worse
Most cases resolve within a day, but blood-streaked mucus or black tarry stools indicate intestinal lining damage requiring vet intervention. Press gently along her spine — if she flinches or arches away, vitamin A may be causing painful bone changes already. Small cats progress faster to severe toxicity than larger animals.
Note her litter box habits: straining without production suggests constipation from gut slowing, while frequent small amounts signal colitis. Both warrant urgent care to prevent dehydration or megacolon development in her delicate system.
Preventing future access
Childproof latches won’t stop a determined cat — store supplements in screw-top glass jars inside closed cabinets. Check your purse or gym bag daily; many owners don’t realize their cat will chew through nylon to reach pill cases. Replace fish oil capsules with pet-specific omega supplements dosed for feline weights.
Watch for new chewing behaviors targeting plastic or foil wrappers, as vitamin A’s fishy smell creates lasting cravings. Redirect this oral fixation with silvervine sticks or frozen broth cubes to satisfy the urge safely.
The step-by-step response, from the first minute to the vet visit, is in our Vitamin A Toxicity in Dogs and Cats emergency guide.