^ Exactly.As an aside, and this is my opinion.. their cat was out loose without being fenced in I am guessing.. So while it is your fault the dog got out, it's also partially their fault that the cat was out. My cat is indoor/outdoor, and if she is killed by a loose dog, and she's outside of my fence, that's my fault. Just how I see it- it's one of the risks of having animals outdoors.
If you're going to let your small furry animal roam, then sooner or later it'll likely be killed by something whether it's a dog, fisher, coyote, or car. So don't feel too bad about that, it was bound to happen sooner or later. Your dog was just being a dog- it doesn't mean she's aggressive or bad.
As others have stated, huskies are known both for being escape artists and having high prey drives.