The most common reason owners ask about vitamin e dosage for dogs is the fear of doing harm while trying to do good. That’s a healthy instinct. Vitamin E is generally considered to have a wide safety margin in dogs, but “generally safe” still depends on the individual dog, the rest of the diet, and what else is being given (Barbeau-Grégoire M, 2022).
Rather than chasing a universal number, ask a better question: what is the total daily intake from food plus all supplements? Bring labels to your vet, especially if your dog is on a therapeutic diet, has fat-malabsorption concerns, or takes medications that affect clotting. Excessive vitamin E can cause adverse effects, so dosing should be deliberate, not casual (Xiong Z, 2023).