Jim Kjelgaard 
Two Dogs and a Horse [EPUB ebook] 

Actually three books in one, this book contains three unrelated stories. The first is about a dog's encounters with a wild dog who has killed the dog's owner. The second is about a wild stallion who is befriended by a boy. The third is about a dog who is believed to be a sheep-killer who is taken in by a boy.
–from (A Kid's Review) Two Dogs and a Horse is a wonderful book. It is written so well… the book is great, I rate it a 10 out of 10!!