I am glad you were able to have your little dog rehomed, I was worried that you would find it too difficult as he had bitten, but he bit you because he was stressed (even if it was all of 15 minutes previously - he's a dog not a goldfish). It must have been a really difficult decision to make but i totally understand why you made it.
As for the fucking idiot who boasted about killing a dog, well fuck etiquette - two things.
I call troll, YES, TROLL TROLL TROLL i didn't read the other thread, in fact, i didn't even read the post where someone brought it up - i read the disgusting troll saying that he had no regrets about killing someone's pet.
I don't believe him, no one would admit to that unless a) they hadn't actually done it and was just trying to upset people or b) had some serious issues.
I think MNHQ's response is extremely bad form, this should have been investigated and the poster banned and reported to the police, i believe deliberate animal cruelty is a crime after all. But no, we get our fingers rapped for calling him out on it. I can't help but wonder if its because he is a man and they don't want to be accused of sexism. It seems an extremely lame response to me.