I find no fault with your allegory. I thought it very apt. 2 Peter2:22 'n'all that.
I can't stand to see a person allow a dog to lick his face, let alone a child's face. I do like dogs very much but they are meant to be of benefit for man. Nowadays they take all the neuroses of their owners, what with pet psycholgists, neurologists, etc. If a dog is sick, better to have it put down. They are also a dirty animal and are portrayed as such in the Scripture.