#1 - March 9, 2015, 9:57 p.m.
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Kill it.
I'm sure most of those reading today have already synthesized this information, but!... If the match starts out and the hunter doesn't have a pet out, and then summons it and it's low, swap to it and kill it.
It's going to have about 80-100k health, but your efforts will be rewarded. This by no means gets rid of the issue, but it does mean if you see a red pet running around with 20% health, you would be wise to swap to it and dispatch it.
Hopefully the bug is fixed soon, would suggest opening tickets as you encounter the issue. there is plenty to complain about atm, but this explains at least some of the absurdity that's been happening in respect to damage.