I realize this is a long guide, but by reading the entire thing, you will get more out of it. I try to repeat important points in each different lineup involving one of the same classes, but it gets tedious and I may forget to add some things that I already have 1 or more times in other strategies involving that class.

Druid/Hunter is in my opinion, one of the most powerful 2v2 compositions that there is. I prefer it to Priest/Hunter for a few reasons, including, Druids are much more durable vs. melee, have more mobility than Priests, have heavy CC, and they compliment my play style. It really doesn't have many hard counter combos when played correctly; my druid, Darkalpha, and I typically only lose to very skilled Warlock/Rogue teams and T6 geared double DPS teams, and we win more often than we lose against them.

Even if you lose games to comps that you shouldn't, don't get discouraged. As long as you learn something from the game, that's all that matters. Points never stay solid, and you can always get more points to make up for any you may lose.

Basic Information

The Druid/Hunter team is all about control and mana drain. Every 15 seconds, every time Viper Sting is up, you need to use it; you cannot overlook this it will cripple your team. You need to develop synergy between your Druid and yourself through excellent communication and experience playing together. To beat some of the best teams, you need to be able to completely shut down melee classes to avoid damage and avoid getting low on mana. With this comp, the games are often very long, so make sure you have plenty of arrows, and you and your Druid both have at least 200 arena water each. I only carry about 160, but Darkalpha has 1200 or more on him at all times. Use Scorpid Sting against melee DPS teams such as Druid/Warrior, especially when they go on your Druid. Always use track hidden. A great way to interrupt spell casts on yourself, mainly CC casts is to Feign Death.

I cannot stress enough how important communication is.

Know where your partner is at all times. It really helps to put up raid markers so you can see each other through obstacles. Never get low on mana, this is mostly true for your Druid. If your Druid gets even remotely low on mana, for example 60%, you need to CC spam your opponents so they can drink. This obviously only holds true for single DPS + healer teams. Double DPS games are over too quickly to warrant drinking. Always have Aspect of the Viper up, unless you encounter a double DPS team.

A message from Darkalpha - Basic overall Druid concepts
Stay mobile and stick close to a pillar. A druid that stands still is a Druid who is vulnerable to any number of CCs/interrupts. Stick to your HoT's, and always be on the move to stay out of your enemy's line of sight. You should never, ever, stand still except when you're casting cyclone and roots, always be trying to gain better positioning on pillars so you can break LOS if they decide to turn to you. Regrowth should almost never be used except on very rare occasions (You baited a counterspell and your partner is below 50% life and taking heavy damage, for example).

Pet
I use a Scorpid pet for Scorpid poison, in order to cheese the dispel mechanic with Viper Stings. He has Avoidance, Cobra Reflexes, Frost Resistance (Rank 3), Great Stamina (Rank 3), Growl, Natural Armor (Rank 3), Nature Resistance (Rank 5), Scorpid Poison (Rank 5), and Shadow Resistance (Rank 5). Max out Shadow Resist to help it survive vs. Warlock/Healer teams, and max Nature Resist to help resist Entangling Roots and Hibernates on it vs. Druid/DPS teams.