Through respeccing and dual spec it is possible to obtain unlimited talent points for your hunter pet.
Step 1: have dual spec.
Step 2: Take Beast Mastery in one spec for the extra 4 pet talent points, and invest them.
Step 3: respec.
Step 4: Reinvest your pet’s talents in your new spec.
Step 5: swap talent decks, and then swap back again. You will now find a number of new, unused talent points in your pet ready to be allocated appropriate to your level, but the previous talents will still be allocated.
Step 6: repeat until you have completely filled your pet’s talent tree.
This doesn’t have outlandish implications for pve, but it has monstrous implications in pvp and in that scenario is completely game breaking and unfair. This requires immediate attention.