dot: dash in name

Just include the node names in double quotes like this:

digraph test {
    "some-name" -> "other-name";
}

Since I faced the problem, the same goes for subgraphes names:

digraph G {
    {node "A-1"}
    {node "B"}
    subgraph "A-1B" {edge [dir=none]"A-1" -> "B"}
}