i just wanted to confirm that Mist Howler is on a 12 hour spawn time.  I was searching for him around 10:30 last night, i asked in general chat if anyone had seen him and a hunter said she had just tamed him no more than a minute ago.  I kept checking back every hour with no luck so i went to bed.  I started looking again at 9:30 the next morning searching his area every 15 mins or so, until i found him with my /target Mist Howler macro at 10:36AM, great pet, runs quick too, however he does not come with Bite, you need to have it already if you want him to have it.