<trying to overfill a tiny bag...>
They use vanilla animations, so they would not have the same issue
And I believe this one doesn't have the issue as its the standard gold dragon. Its only if you use that particular animation set they have the issue
I believe the problem is in element (sub-object) count, rather than a certain animation.
I seem to remember the CEP dragons had a few too many elements (the Remorhaz Pstemarie recently renovated had the same problem before he simplified it).
As Shad says, the non-targetable workaround is just that. The models really need a bit of (g)Max love :-)
But then again, I haven't visited them in at least three years, so I could be crazy :-P
<...and losing his marbles>