What can I put in my dog's food to give him a nice shiny coat? I don't want to change his food. I just want to add something. Can I use vegetable oil, olive oil, or raw eggs?

An omega fatty acid supplement may help.

In order to have a nice shiny coat it is necessary to provide your pet with a good quality diet. In general, supplementation is not necessary; however, in some cases adding an omega fatty acid supplement can do great things for a dry, brittle hair coat. These nutritional measures take a minimum of 10 to 12 weeks to start making a difference in the appearance of the skin and even longer for the hair coat.

You should speak to your veterinarian about which product he or she recommends and how much you should give your dog. It is best to use a fatty acid supplement that is formulated to enhance coat appearance rather than just adding oil to the food. These commercial products provide a balance of fatty acids that are optimized to use a minimum amount for the maximum effect. Excessive oil in the diet can lead to loose stools and obesity. Additionally, you should not give raw eggs to your dog. Raw eggs may be contaminated with Salmonella, which can cause a serious infection. Additionally, egg whites also contain a protein called avidin that binds biotin, part of the B vitamin complex; feeding raw eggs may result in a vitamin B deficiency that could be detrimental to your dog's health.