How 4 kg body weight changes the equation
Your cat's small size makes two crushed pear pits potentially more significant than they'd be for a larger animal. At 4 kg, her system has less capacity to neutralize toxins before they reach dangerous concentrations. The chewing action matters tremendously here - properly crushed pits release far more amygdalin than whole ones passing through the gut. Watch for symptoms proportional to her petite frame: shallow breathing appears sooner in small cats, and weakness becomes obvious faster.
Isolation serves two purposes - it prevents stress from other pets that might mask early symptoms, and lets you monitor litter box use closely. Cyanide affects kidney function, so urine output matters. Set up her quiet space with a familiar blanket and water bowl, but withhold food for now - an empty stomach helps if veterinary treatment becomes necessary.
Why the other cat isn't necessarily safe
Even though your second cat didn't consume pits directly, monitor them both for environmental exposure risks. Check areas where the chewed pits occurred - saliva on toys or bedding could transfer small amounts of toxins through grooming. While this secondary exposure is unlikely to cause poisoning, it's smart to wipe down shared surfaces and provide fresh water bowls.
The psychological factor matters too - some cats become stressed witnessing a companion's distress. Watch the unaffected cat for unusual hiding or appetite changes that might suggest anxiety. Separate litter boxes help track which cat shows digestive changes if symptoms develop. This careful observation continues for 12-24 hours even if the exposed cat seems fine initially.
What 'crushed' really means for toxicity
The degree of chewing determines risk more than pit count alone. If you heard distinct cracking sounds or found pit fragments, that confirms enough mechanical breakdown occurred to release amygdalin. Compare this to swallowing whole seeds where the hard outer coating often survives digestion intact. Your cat's dental health plays a role too - sharp, healthy teeth do more damage to pits than worn or missing ones would.
Examine the area where she chewed the pits - look for oily residue (amygdalin breaks down into compounds that leave a slight sheen) or distinctive almond-like odor. These clues help estimate exposure level. The two-hour mark post-ingestion is key - most life-threatening symptoms appear by then if they're going to develop at this dose level.
Creating an effective monitoring plan
Instead of constant staring that might stress your cat, set up periodic checks every 15 minutes for the first two hours. Note gum color, respiratory rate, and alertness each time - subtle changes accumulate meaning. Use your phone camera to document gum color in consistent lighting; pink turning to rose then brick-red shows progression. Keep a notepad by her isolation area to track trends.
Prepare for possible transport - gather medical records, carrier, and any remaining pit evidence. Know your emergency vet's location and after-hours protocol. If no symptoms appear within four hours, the risk drops significantly but isn't zero - maintain lighter monitoring for another 12 hours. Hydration matters now; encourage water intake by offering ice chips or wet food if she's reluctant to drink normally.
The step-by-step response, from the first minute to the vet visit, is in our Pear Pits and Seeds Poisoning in Dogs and Cats emergency guide.