Once you ressed your pet, a buff will be applyd to you "Revive Pet", if you remove it your pet will be at 100% HP =)
Here's a nice macro:
#showtooltip Revive Pet
/castsequence Revive Pet, Revive Pet
/cancelaura Revive Pet
Click it once to ress, right after you ressed click it a few times =)
Edit: Added tooltip (Thx to heftydogg)