My Water Bug is 23 foot, and I have 3 spaniels on mine! Agree with above!
I don't live on it, and have done about half the system now in fits and starts over 5 or so years. You don't need a mooring to get a license, but if you decided to become a continuous cruiser (as I am), then you do need to move around the system, but that is the delight of it all! I'd hate to stay in one spot. BW, now CaRT will keep a record of where you go, but I find it fun to keep a log myself to keep in mind all the quirky little things that happen, and when I fill up with water or diesel (I have an inboard diesel engine). I reckon on 1 hour per litre.
Of course you can just do a 3 point turn when you want to change direction too.