I won't say Laev is bombproof, because she's not. She can be suckered into a reaction by almost anything fast-moving.
But she is remarkably blase about some things. This morning, for example, I was vacuuming over her. She just quietly chomped a teddy bear while I ran the vacuum behind her and reached over her to vacuum the other side.
Of course, I did have to ask her to leave the bear's head attached, so I guess she isn't totally calm and sweet. :-)