You will get many responses but the fact is we don't know, because it doesn't happen very often. The story about a German Shepard being killed by a tarantula sounds dubious, at best...I'll certainly be checking that shortly, and I'm hoping for a solid source of info on that topic, instead of some drama queen on a bite report forum stating that it happened. But as to your question : Just don't buy old world T's, and you should be fine. There are plenty of new world T's to choose from, some with serious attitude problems that will give you that "old world feel" haha. Hope this helped.Weird question I know, but the rule in my house that my SO can't own anything that if for some reason got out, would kill or serious maime my cats or dogs.
So quick list of species that would be -seriously- (more then just painful) harmful to cats/dogs would be great.