Oh, that's awful, I've got cats who get that way sometimes and it feels like some sort of betrayal when they do. We've got this one dog, Rowdy, who's a-- I can't ever spell this right-- shitzu? And she's generally the laziest, floppiest dog ever, until we give her a bone, then, if we even get too close, she snaps and growls, and if my other dog Elmo comes near, she attacks. Luckily, Elmo is really gentle, since he's bigger... Rowdy sort of thinks she's a Great Dane...

But I know how awful and nervous that sort of thing can make people. *hugs* Pets are remarkably able to get over stuff like that, I think.