Marmaduke

1. Complete Siren Isle quests up to & including Laid To Rest At Last, and complete any world quests to prevent phasing issues.
2. Talk to Suzie to go into the storm phase: /way #2369 69.09, 49.25 [npc=227815]
3. Go to the upper level of the abandoned inn and pick up the squeaky toy by the wall past the furthest bed: /way #2369 39.31, 54.25 [item=233027]
4. Give it to [npc=234172] by interacting with him. He runs in a loop so check out the map on that page, but I usually see him at /way #2369 44.07, 49.24
5. Go back out of the storm, to /way #2369 68.31, 44.96 [npc=234357]
6. /pet him, pick up his quest, and complete it (pet him more!)
7. Turn it in and receive him as a pet:  [item=233056] / [icondb=5279603] [npc=234365] / Marmaduke

I completed this quest this morning, I had No Problems with it. make sure your IN the STORM when you go to pick up that toy & Look for Marmaduke. Once you give Marmaduke that toy in the Storm, go back to camp, come out of the storm, Your gonna find him near a telescope. he gives you another quest to pet him, and once you pet him.... HE's YOURS. Good Luck.

Completed the quest and couldn't pick up squeaky toy. Turned off all of my add-ons and still cannot pick up toy. This appears to be bugged like some other quests. Someone on warcraft pets said they had same issue and that the world quest "Storm's a Brewin" was interfering with the marmaduke quest line. Complete the world quest and try again. That quest line is the one where you go the storm version of the Siren Isle.