hi..balance diet is acheived over a period of time and if u r worry of not supplying enough vitamins and minerals..you can try addin multi Vit...as for vitamin E...you can try feeding EPO (Evening Primrose oil) for skin and coat..if ur dog like fish...you can try to feed ur dog fish once a week will do..it is rich in omega 3 (good on skin and coat too)...cos meat contain more protein and omega 6, it is advisable to feed fish once a week to balance out the omega. Alternately, you can try feeding fish oil (which can be found in pharmacy)...
If you are worry about vit A...you can try cod liver oil but it is not advisable to overfeed cod liver oil...will cause more harm than help...i would suggest reading up books by Ian Billinghurst - Give your dog a bone or kymythy schultze - The Ultimate Diet (simple to read and understand) and it also list out all the vit info. and a simple diet plan too...