Would those people saying "it's just a dog" please consider the fact that a dog has the level of understanding of your average 3-5 year-old HUMAN child?
Pause for a minute. Is not the torture and murder of innocents (prime example being children) one of the worst crimes imaginable? For example, Baby P, Damilola Taylor, Jamie Bulger. We have a special connection to these cases because children also symbolise our future, but objectively the act is the same. (I refuse to put 'IMHO' or whatever at this point, I'm sick of walking on eggshells).
Bob is spot on. I'm a vet, but I eat meat, and have and will continue to put animals out of their misery for as long as I am working. As a profession, veterinary care is often equated to Paediatrics, because the patients are difficult to work with, and you must first communicate with those responsible for them.
A dog's place in my home is as a family member, plain and simple. They are my charges, and I love them as they love me, unconditionally. The breach of that kind of trust is evil. It is the torture and murder of those who would otherwise love you most, a truly hideous crime. This is not a comparison to rape, murder, etc. Murder, (but not rape) is occasionally justifiable, though we like to dress it up as 'capital punishment' or sanctioned and 'humane' killing.
Come in my house and threaten those I love (Girlfriend, parents or dogs) and you are in severe danger of losing your life. I can justify this to myself, if not as a Christian, then at least as a human. The killing of those to whom we bear responsibility cannot be justified, for any reason, at any time.