Heal ONLY Summoned Pet

How do I make a healing spell only be abel to heal the summoned pet...?
the archer is the only class abel to summon 1 pet
and the player is only abel to have its hero and maby a pet

the spell is suppose to be called "Heal Pet"
so thats all its suppose to do is heal the pet

As long as the pet is the only unit the player can have besides his or her hero, go to the spell's targeting options in the object editor and set them to "player units" and "not self".

dont work i can still heal allied units

Perhaps you'd be better off making the "Heal Pet" spell just a dummy and make a trigger that runs when that dummy spell is activated.

The trigger would then create a caster unit that the player won't see that casts a heal spell on the pet.