In most cases, a small amount of egg is safe for a cat to eat. Eggs are a good source of protein and provide many essential nutrients including vitamins A, B6, B12, D and E, riboflavin, folate, niacin, iron, zinc, calcium, omega-3 fatty acids and antioxidants.
As with any ‘treat’, limit the amount and frequency you feed as this adds excess calories to the cat’s diet. An average 4.5 kg (9.9 lb) cat on a maintenance diet should consume 246 calories per day, and one egg is approximately 74 calories (310 kilojoules), which is just under 1/3rd of the cat’s total daily calorie allowance. While eggs contain many beneficial nutrients, they are not balanced and complete, cats are obligate carnivores and must ingest meat to survive.