My German Shepherd is to skinny
I have a 16 month old dog called Axel. He eats like a horse, however he is really skinny. Not so skinny that you can see his spine but there is a clear outline of his rib cage (not each individual rib). My other two shepherds are the right weight for their size. Axel is extremely large by breed standards standing standing 5-7 inches taller then my other 2 and he also came form a straight backed working line. Any advice on what I could feed him to help him put on weight and to look fitter would be appreciated.
He is currently fed royal canin dry food along with half a tin of pedigree wet food twice a day.