Hi,
Have 3 dogs (labrador and 2 Vizlas). The best I've found is Vitalin Active. Comes in at £10 for 15kg bag And has minimum 30% chicken compared to 4-6% in most other brands. Dogs love it and it's cheap as chips. Also fire in some tripe or beef from daf animal feeds £9 for 20lbs. hope it helps. Had a litter of nine vizlas and there all doing great on it as well. Every dog is different so good luck