Contrary to popular belief, you don't need to head straight to the low protein recipes. Your dog needs a high meat recipe to help build lean muscle, and high meat recipes come with high protein levels - highly digestible, 'good' protein. The most ideal recipe is TP Feeds Grain Free 80:60:20 as it is rich in highly digestible protein, whilst being low in carbohydrates and fibre. The 80% salmon, trout, haddock and herring provides high levels of omega 3 fatty acids which can help your dog feel fuller and promote weight loss.
Another action you need to take is to check your dog's portion size. When consulting the feeding guide, remember to use the amount related to your dog's optimum weight, not his/her current weight. Also, remember that this is only a guide and is based upon an active, working dog. If your dog is older, less active and/or neutered, you will need to considerably reduce this amount.
TP Feeds Hypoallergenic Chicken is also worth consideration - the dried chicken is a natural source of L-carnitine which helps to maintain a healthy weight and promote lean muscle development.