How much raw egg white actually got into your cat
A lick from an eggshell transfers barely any egg white—likely less than a drop. For a 5 kg cat, this microscopic amount won't interfere with biotin absorption. The real concern would be regular meals of raw egg whites, not this accidental taste. What you're dealing with is surface contact, not meaningful ingestion.
Focus on cleaning rather than worrying: gently wipe your cat's lips, chin, and paw pads if they touched the shell. Residual egg white can dry sticky and irritate sensitive skin. Use a soft, damp cloth—no soap or harsh scrubbing. Cats groom compulsively, so removing traces prevents them swallowing more while licking themselves clean.
Why timing matters with potential biotin issues
Biotin deficiency develops over weeks of daily raw egg white consumption because avidin binds the vitamin long-term. A one-time exposure is like missing a single vitamin pill—it won't affect your cat's reserves. Their normal diet contains enough biotin to cover this tiny gap.
Watch for unrelated symptoms that might coincidentally appear: slight lip swelling (rare allergic reaction) or excessive face-rubbing (irritation from dried egg). True biotin deficiency signs—brittle claws or hair loss—wouldn't show for months of repeated exposure. This incident doesn't start that clock.
The next 48 hours with a curious cat
Expect zero noticeable effects from this amount, but monitor two things: grooming behavior and energy levels. Some cats dislike the feel of egg residue and may paw at their mouths briefly. A single episode isn't concerning, but persistent scratching warrants a vet check for irritation.
Lethargy is extremely unlikely here but always worth noting—if your cat sleeps more than usual or skips meals in the next two days, call your vet. This probably relates to something else (like an upset stomach from scavenging other foods), but it's good to rule out rare egg allergies with a professional.
When raw eggs become a real problem for cats
Risk scales with frequency: if your cat starts seeking out cracked eggs weekly, that's when biotin deficiency becomes possible. Chronic exposure overwhelms dietary biotin, unlike today's insignificant lick. Also watch for salmonella risk if they access raw eggs often—bacteria matter more than avidin in long-term cases.
Prevent future access by rinsing eggshells before disposal and keeping counters clear. Cats remember tasty finds—one lucky lick can turn into a habit. For now, rest easy; your quick response means this stayed a non-event. Just store eggs securely next time.
The step-by-step response, from the first minute to the vet visit, is in our Raw Egg Whites (Avidin) Poisoning emergency guide.