Why vomiting changes everything for a seed-eating cat
When your cat throws up after eating quince seeds, it signals her body detected something harmful. While vomiting can sometimes remove toxins, it also means some compounds may have already started absorbing. For a 3 kg cat, even a small amount of cyanide-releasing compounds from chewed seeds can be serious, so the vet visit isn't optional.
The seeds' hard coating might have protected her somewhat if swallowed whole, but cooking softens them, making it easier for teeth to break through. Your cat's vomiting suggests she chewed the seeds enough to release some compounds, triggering her gag reflex. This is different from a cat who eats seeds but shows no symptoms—her reaction means the vet needs to assess how much might still be in her system.
What the vet checks first with quince seed exposure
Bright red gums or a bitter almond smell on your cat's breath would immediately alert the vet to cyanide compounds, but these are rare. More likely, they'll start by examining her mouth for seed fragments and checking her gum color—pale or bluish tints suggest oxygen issues. They may rinse her mouth to remove any remaining seed residue that could continue releasing compounds.
Next comes blood work to check her red blood cells' ability to carry oxygen. Unlike some toxins that take days to show effects, cyanide compounds from seeds act fast if absorbed. The vet isn't just looking for current damage but predicting whether her small body can handle what's already circulating. For a cat who vomited, they'll also assess dehydration from fluid loss.
Post-vet monitoring: the critical 24-hour window
If the vet sends your cat home after treatment, the next day requires intense observation. Any lingering compounds will cause symptoms within this period—watch for lethargy that worsens instead of improves, difficulty breathing, or loss of coordination. These would mean a return trip immediately, as her small size leaves little margin for error.
Keep her in a quiet, dim room to reduce stress on her system, and offer water frequently to help flush any remaining toxins. Don't be alarmed if she sleeps more than usual—recovering from toxin exposure is exhausting—but wake her gently every few hours to check her responsiveness. If she refuses water or can't rouse fully after sleeping, that's an emergency.
Preventing future kitchen hazards for curious kittens
Your kitten's size and curiosity make her especially vulnerable to seed toxins. After this scare, treat quince prep like handling broken glass—clean every surface immediately, and never leave cores or seeds unattended. Consider coring quince over a trash can so seeds fall directly into it, eliminating the chance of them bouncing onto the floor where she could find them later.
Store whole quince in a closed cupboard, not on counters where batting paws can knock them down. When simmering quince for recipes, do so when your kitten is confined to another room, and dispose of the cooked cores in an outdoor trash bin right away. Remember—it's not just the seeds; even cooking water that contained seeds could pose a risk if she laps it up.
The full verdict, portion guidance and serving notes are collected on the Quince food facts page.