Pork Kidney

Pork kidneys are a nutritious addition to a dog's diet, providing a variety of vitamins, minerals, and protein.  
Vitamins:
Pork kidneys contain vitamins A, B6, B12, C, E, K, niacin, and riboflavin. Vitamin A helps with vision and mucus production, while B vitamins help with energy metabolism and the nervous system. 
Minerals:
Pork kidneys contain iron, zinc, and selenium, which help with red blood cell production, the immune system, and tissue repair. Iron also acts as an antioxidant and helps carry oxygen throughout the body. 
Protein:
Pork kidneys are a high-quality protein that helps with muscle growth and hormone production.