Thank you for contacting the ASPCA Pet Nutrition Service, Alondra. Your dog sounds wonderful!
If you are feeding her a high-quality food such as Iams, Eukanuba or Science Diet, then vitamins and supplements are not necessary. These pet food makers work hard to include the right amount of nutrients so that supplements are not needed.
As for her shedding, the amount that occurs usually depends upon the breed or breed mix of your dog. What seems like excessive shedding can be normal for some dogs, but it can also be the result of stress or a medical problem. We encourage you to brush your dog regularly. This will help to eliminate any excess hair around your house. Your veterinarian or groomer may be able to recommend a specific type of brush that will work best for your dog's coat.
Just keep in mind that nutrition can be a factor in excessive shedding, so it’s best to use a high quality product like the ones listed above. We also recommend that you work with your veterinarian to determine what is best for your dog.