I wouldn't worry too much. A thief that really wants it will probably get it no matter what you do. Keeping it out of sight when not in use is probably a good idea and as noted above, a hidden switch between the battery & switch will add a level of security if it's really a concern.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.