This macro only requires that you have the spells Call Pet & Revive Pet, or simply, a Hunter's Pet. Also, this macro will use your player's Focus marker.

How the Macro works... If your pet is dead: You will cast Revive Pet. If your pet is not summoned: You will cast Call Pet. If you are not focused: You will focus on your target and your pet will be sent to attack it. If you are focused: You will clear focus and your pet will be recalled to follow you.

In less technical terms... If your pet is dead or missing: Your pet will be revived or summoned. If your pet is not attacking: Your pet will attack your target. If your pet is attacking: Your pet will stop attacking and return to your side. Hunter's Mark will be cast on the target.

/cast [nopet] Call Pet;[target=pet,dead]Revive Pet
/clearfocus [target=focus,dead]
/focus [target=focus,exists]player;target
/clearfocus [target=focus,noharm]
/petattack [target=focus,exists]
/petfollow [target=focus,noexists]
/cast Hunter's Mark