First of all im 90% sure this is a bug.
Spell name : http://www.db.pandawow.me?spell=35942/furious-howl and all other hunter pet's temporal buffs .
Issue : I see a lot of hunts in arenas start the arenas with 3-4 buffs like that.
You cant buff yourself with 3-4 pet buffs and start arena with a advantage , becouse its a bug .
You can do it using the buff of the pet , then quit pet , summon another pet , use buff , quit it etc..
Screenshot : http://imgur.com/a/Znl60 http://imgur.com/a/Znl60
And there are 2 more screenshots to see its not a visual bug look the haste / mastery / crit in this screenshot http://imgur.com/a/iqJoo
Then look same in this 1 http://imgur.com/a/YGxPh
It's actually a PvP bug so
8/10?
Tested : 25/04/2017
Sorry for my bad english.