How do you cross and intersection with a dog and cat and a mouse, you can't leave the mouse and the cat a lone

Question

And you cann't leave the dog and the cat together, you have to cross one at a time?

Answer 1

1. take cat to other side
2. go back for mouse and bring it to other side
3. when you get there with mouse, leave mouse, but bring cat back across on your way to get the dog.
4. Leave the cat, and bring dog to other side.
5. go back for cat, this only leaves dog and mouse together.

Answer 2

That's an old one.

1. dog
2. mouse
3. cat