Full Idea
There is a difference between the person who allows his terrier to kill wild rats, and the person who keeps tame rats for his terrier to kill.
Gist of Idea
Letting your dog kill wild rats, and keeping rats for your dog to kill, are very different
Source
Roger Scruton (Animal Rights and Wrongs [1996], p.87)
Book Reference
Scruton,Roger: 'Animal Rights and Wrongs' [Demos 1996], p.87
A Reaction
There are areas in the middle, where I encourage pheasants to breed 'wild' on my land. The purchase of a Rottweiller also tests the moral boundaries here.