Stat buffs on pets

[Norathorr]

Does casting stat buffs on pets make a difference at all? I started to question the validity when I cast a sta buff on my pet and unlike when I cast it on a normal toon, it did not seem to show that the pet had any added hp to its hp pool. Like say when I cast sta on someone they might be showing 100% hp and when sta lands they would show 95 till they regen the new hp back.