Why pregnancy makes even small amounts risky
Your dog's body is currently supporting multiple growing puppies, which increases her demand for biotin. Raw egg whites contain avidin, a protein that binds to biotin and prevents absorption. Over time, this creates a deficit that affects her skin, coat, and metabolism—but more critically, it may impair proper fetal development. Puppies rely on her nutrient stores, and a deficiency could lead to weak claws, thin fur, or growth delays.
Unlike a one-time exposure, regular consumption means the avidin builds up. Think of it like a slow leak in a water tank—the puppies are drawing from that supply daily. Signs of trouble might not appear immediately, but by the time you notice dull fur or flaky skin, the deficiency is already established. For pregnant dogs, even weekly egg whites could tip the balance.
What to watch for beyond skin changes
While dermatological signs are common, biotin deficiency can also cause subtle shifts in energy levels or appetite. Your dog might seem less interested in her meals, or she could develop mild digestive upset like occasional loose stools. These are easy to dismiss as normal pregnancy quirks, but paired with raw egg white consumption, they warrant attention.
For the puppies, the risks are harder to monitor pre-birth. Ultrasound won't show nutrient deficiencies, but low biotin could affect their skeletal development or organ formation. If you've been adding egg whites to her diet for weeks, a vet visit can discuss whether biotin supplements or dietary adjustments are needed now.
Alternatives for protein during pregnancy
Cooked eggs are a safe alternative—heat deactivates avidin, freeing up the biotin. Scrambled or boiled eggs provide the same high-quality protein without the risk. If you've been using raw eggs for convenience, switching to cooked eliminates the concern immediately. Even lightly poached eggs (where the whites are fully set) are fine.
Other pregnancy-safe proteins include lean meats like chicken or turkey, which don't carry this specific nutrient interference. If you're supplementing her diet for extra calories, consider plain yogurt or cottage cheese instead—both are gentler on nutrient balance. The key is avoiding any raw egg whites going forward, not removing protein sources altogether.
When to involve your vet proactively
Since she's been eating this regularly, don't wait for symptoms. Call your vet to describe how often and how much raw egg white she's had—for example, 'half an egg white twice a week for a month.' They may suggest a blood test to check her biotin levels or recommend a temporary supplement.
If she's nearing her due date, the vet might prioritize monitoring the puppies after birth for any signs of weakness or poor weight gain. For now, removing raw egg whites from her diet is the most urgent step. Keep track of her meals to ensure no accidental slips during this critical period.
The step-by-step response, from the first minute to the vet visit, is in our Raw Egg Whites (Avidin) Poisoning emergency guide.