[Priest] Shields on Player Pets do not break.

[Eyevou]

While playing with a Warlock friend I found it strange that the pet's shield effect never wore off. It generally will take 2-3 hits then break but it seems that Shield just acts like a buff when applied to Player Controlled pets like the Voidwalker. It will expire when the buff expires but until then they are completely invulnerable.