The Ponter originated in Spain before the 1600's and was later refined to the pointed we know of today in Great Britain. It adapted to some of the native food supplies but it still does better with Spaniard foods then English. Ex. Brown Rice over Potatoes.
The best foods to feed your Pointer would be brown rice, avocado, poultry and fish. You should avoid soy, beet pulp, beef and horse meat or their by products.