Barney's Arcane ability to heal

[Aerospacegod]

I have Barney at Lv22 and noticed his Arcane ability changed from attack to heal you and your party. It's the only pet I've noticed with an Arcane heal(please point out others if you know them). This could be very useful to heal for free every few seconds even if the heal is low.

Since he has 3 h/s regen anyway I found it difficult to determine how much each heal was. It seemed to be between 3-6% (around 72-144). Anyway I'm wondering if anyone knows if his heal goes away and returns to attack at 25/30/35, or gets better. If it goes away I may turn off exp to keep his ability around.

Thanks

Edit: average heal 108 every 12 seconds = 9h/s + 3h/s naturally= 12 h/2 regen essentially. If it grows Barney could be underrated...