Does anyone know what calculations are used to determine how much a pet's health is increase from leveling?
I know the other stats match the level but clearly something else is factored in with health. My two Qitari are the same level, but one has +50 to health from level and the other has +52. Can anyone explain why?
I know it's not from STR because the +50 has higher STR. Could be from AGI since the 52 has one higher AGI. Not sure how to test that.

HP has a different level bonus curve from the other stats (in that is IS a curve, rather than just a straight line that matches the level of the pet exactly), which is based off of what their base HP is. The higher the base HP (and + stat if applicable), the better the level bonus curve. The pet with the 52 lv bonus has a higher base hp than the one with the 50 bonus (290 base hp vs 231 base hp in this case)

for lv75 scaling example,
a random regular wild pet with wild-tier base stats with 100 base hp who has 1,220 lv bonus
vs a max stat, whose 2000 base hp means his lv bonus curve gives him 3,327


(I couldn't tell you the actual maths though)