I'm surprised how a certain part of this site's audience have no problem in proposing the use of force in guiding people's lives, and then at the same time claim it is in the name of "liberty". In this particular case I'm sure they would see no problem in killing that dog (and call it euthanasia or some other fancy name) and please don't let me go on the obvious slippery slope from there.
(EDIT: 5 minutes after and the killing was advocated. I rest my case.)