PR 4 ProFish 16x2lbs BoxPerfectly Raw 4 ProFish 16x2lbs Box As the name implies, this mix contains 4 different protein sources including Pacific Coast Salmon. This high protein, low fat formula, provides energy, develops bones, teeth, and strong muscles. The Salmon is a good source of omega 3 fatty acids, which supports a healthier immune system and a silkier, more luxurious skin and coat, so your dog can shine inside and out.