To make a long story short you cannot give dogs human vitamins. If your dog is itchy or you are simply looking to support skin and coat health in your dog youll want to give about 180 mg of EPA and 120 mg of DHA for every 10 lbs. Ascorbic acid vitamin C vitamin A and calcium phosphate seem to be the only things human multivitamins and dog multivitamins have in common at least when it comes to the most prominent ingredients.
As a result the chemicals attach to the dogs liver and slowly destroy it. Omega 3 fatty acids namely fish oil are also beneficial for dogs. Vitamin C niacin biotin and folic acid are also safe for dogs.