evidence that supports that John Thornton loves Buck

Thornton loves Buck. He saves him from Hal Suddenly John Thornton springs upon Hal and drives him back, telling him that he will kill him if he hits the dog one more time. Hal tries to retaliate and gets his knuckles slashed for his troubles. John cuts Buck's traces, and the team proceeds.Thornton gently nurses Buck back to health and Buck loves him in return.