Sorry I missed a word in there... Should be NEAR immune to fire hehe..
I remember very specifically raids on
Lord Rak'Ashiir where I was using my fire pet with a few other mages to kill Rak, and it was quite rare that my pet would be affected by the AoE, and was almost always fully resisted, but when it would go through it was always partially resisted way down and that AoE has a -100 fire resist check.
If a -100 resist check AoE hardly ever lands, then it's safe to say that mobs that are casting fire based nukes that are class based (which more often than not have a 0 resist check unless it's a wiz but they only have an innate -10 resist check on some of their nukes) then it's pretty obvious that the pets don't have their innate high resistance like on live.
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If you look at the comments on rak-ashiir you can see a ton of people talking about using mage fire pets to take him down with only a few pets. Rak was never really that difficult, never hit very hard. It was all about the AoE that made things difficult.