what is the best food to put a 8 month old pup on which is very overweight he is about 20 pounds over weight and was wondering which food is the best to give to a pup we are building up his excercise level slowly but he still needs the right vitamin level for growth etc .

can any one advise please.

I suppose it depends on how you are feeding the pup, but if you feed a raw diet pups need approx 10% of their body weight  each day and you can alter this if they are putting too much weight on by decreasing the amounts and if they are unerweight by increasing.  Once the dog is an adult their requirements are much less and they need approx 2% of their bodyweight daily.

I can't help with complete or mix dog foods though.

As you say the pup is still growing so needs all the right amount of vitamins for growth, maybe you need some expert advice.  Do you have a breeder that you could speak to?  I know you say the pup has been returned so I take it you are a breeder, but maybe you know more people within your breed?