How moldy capsules differ from food
Powdered supplements concentrate mold toxins because moisture trapped inside capsules accelerates spore growth. Your cat ingested a higher toxin dose per ounce than if she'd eaten moldy bread—and her smaller body weight magnifies the impact. The capsule's casing also delays digestion, so signs may appear later but hit harder.
Senior cats face extra risks: their kidneys filter toxins slower, and existing arthritis makes tremors more painful. Watch for stiff movements or reluctance to jump—these can signal early neurological effects before visible shaking starts.
The tremor timeline for cats
Felines often hide symptoms until toxins overwhelm their system. What looks like "just shivering" could escalate to rigid limbs within minutes. Unlike dogs, cats rarely drool or vomit from mold toxins—their first obvious sign may be collapsing mid-step when muscles fail.
Since the capsule was eaten hours or days ago (hidden in the drawer), toxins might already be circulating. Don't wait for worsening signs; tremors exhaust cats faster than dogs due to their high-strung nervous systems.
Why seniors need faster action
Older cats struggle to regulate body temperature during tremors. Their thinner fat layers and slower circulation make overheating or hypothermia likely once shaking starts. Pre-existing conditions like heart murmurs also strain under the stress of toxin-induced muscle spasms.
Vets may prioritize blood tests for seniors to check organ stress from the mycotoxins. Your cat's age means she'll need closer monitoring even after tremors stop, as recovery takes longer.
The danger of partial capsules
You might think "she only licked the powder," but mold spores release toxins even in tiny amounts. The supplement's probiotics likely worsened mold growth by creating a bacterial playground. Ingesting even half a capsule's contents can trigger severe reactions in a 4.5 kg cat.
Check drawers for other compromised supplements—cats revisit discovered "treasures." Unlike food mold, supplement mold lacks obvious odors or colors, making accidental repeat exposure likely without thorough cleanup.
The step-by-step response, from the first minute to the vet visit, is in our Moldy Food, Compost & Bin Raids emergency guide.