If you use any addon that automatically summons a minipet for you, it may screw up some of your quests! The first one I found was the seahorse quest in Vashj'ir, where the seahorse will despawn before it gets to you due to the minipet addon noticing yours has been dismissed and summoning another one. Similarly, the quest The Twilight Flight in Deepholm will not spawn a drake for you to ride if your minipet addon is summoning for you. I was able to complete both by turning off the auto-summon option in Livestock (after a lot of QQ not knowing what was bugging the quest!).
I`ll be traveling over the next week, so I have some recycled posts for your reading pleasure along with some screenshots. Happy holidays, and see you next year!