When we talk nutrients, there's possibly none which is harmful to the dogs. I meant the ones which are pet-recommended. Although, it's important that you serve them the right suitable amount of the nutrients. You can get in touch with your regular vet and make a diet plan for your pooch that keeps all the nutrients in a balanced way. For example, nutrients like protein, calcium, phosphorous, sodium, Vitamin D etc. should be offered in a controlled manner. Overdoing it will invite trouble.