Am I missing something or are Smn pets super squishy?

[Renryuu]

Heya, as I've been catching up on my dungeons and stuff I can't help but noticing my pets are losing way more health than normal. It seems like many attacks from bosses and stuff end up taking off 1/3 to 1/2 of their health and so I'm having to spend gcds just trying to keep them alive and was wondering if this is normal or if I'm missing something?

I remember something about pets being nerfed back with Ramuh due to Titan-egi being able to tank Ramuh but even back then I don't remember them losing this much health from attacks after that adjustment.

[Viviza]

Pets take greatly reduced damage from area attacks. I don't think the general rule has ever changed.

Ramuh had a unique property in that all of his attacks were AOE, but this was changed so that Titan-Egi couldn't be a main tank. I don't know the exact nature of the change but you can sort of consider it 'everything gets attacked individually within this range' rather than true area damage. It's kind of semantics for sake of game balance.

DOTs like poisons have also always wrecked pets. There's a few points in the new dungeons where poisons can stack up and do a lot of damage.