Our kennel breeds only Alaska racing huskies. These are the fastest, most durable athletes in the racing dog world. They are a well bred mix of Siberian husky, and working herding and hunting dogs. I like to play piano. My class followed people in the Iditarod.
Horses are slower learners, and less personable.
Dogs, on the other hand, learn quickly, and no matter how many you have, you are their best friend. With horses, when you add a second horse, you lose best friend status. What do you feed your dogs. I feed my kennel a top quality commercial dog food. The racing portion of the kennel eats the best of the top quality dog foods, plus a variety of meat, fats, fish, and special highly digestible additives.