Can I Give My Dog generic d-alpha tocopherol?

Yes, with care
Vitamin E is commonly referenced for dogs at published doses. Published guidance for dogs: small: 100 IU; medium: 200 IU; large: 400 IU daily, every 24h. With a meal (fat-soluble). High doses interfere with clotting, stop before surgery.
Source: Veterinary Partner (VIN)
Get the exact range for your dog's weight

Skip it or ask a vet first if

bleeding disordersbefore surgery

The safe habit

Confirm any medication decision with your veterinarian, who knows your dog's health history and other medications. VetDose shows published reference data, not prescriptions.