I don't believe that there is one meal that is superior to all; however here are 2 websites that you can reference for homemade complete balance meal options for your pet.
https://secure.balanceit.com/ https://www.petdiets.com/ A complete and balanced diet is best to promote a healthy haircoat. There is no medicine used for generalized shedding of the hair. However you can supplement with pet formulated omega 3 fatty acids to promote a healthy shiny haircoat. If you pet has actual bald areas, then its best to get him tested for a possible mite problem and treatment through your vet.
A complete and balanced diet will also ensure proper growth and weight gain for your pet. Also regular dewormings can treat for any underlying intestinal parasites that can cause improper growth if left untreated. Some broad spectrum dewormers commonly used are Pyrantel Palmoate and Fenbendazole. THese are usually readily available at your local pet store or feed store.
I hope this helps! Good luck with your pet moving forward.