The Russians did this in early space travel. But, we would have a major problem. One of the main reasons we get along so well with animals is that they can't talk back. And that's what stops us from sending one of them slip-sliding into the void. Even if they managed to return, they couldn't tell us anything meaningful about it.
Black holes are fascinating.
I can think of nothing else that has so captured the imagination of humankind. It seems so unreal and impossible that I sometimes wonder if we aren't having our collective legs pulled. We may never know. I know lots of people won't believe in them until they see them. Yet people have been reporting sightings for better than 50 years already.