I have a few backpacks that can be pressed into service. My current (and somewhat inadequate) BOB is a backpack. While I would never use one normally on a bike it would be fine in an emergency situation.

My dog is such an energetic beast that he would never sit still in a sidecar. If I could figure out a way to harness him to the bike then I may be on to something. As he gets older though a trailer or something might work. <img src="/images/graemlins/wink.gif" alt="" />

Actually there is a great line of trailers sold under the BOB name. Maybe they are trying to tell me something.