the ones I have seen would not be too heavy, but they would be to bulky t be comfortable. they make safey collars with bells on them that are very very sensitive to the slightest movement, so that might work, although they do eventually learn who to walks without ringing the bells., but that takes time, and a lot of cats actually like to ring it so you can hear them and do it on purpose. a couple of my cats will ring their bell collar  as they walk by me to say HI :)

On Jun 16, 2013, at 5:40 PM, Howard Kaufman <[log in to unmask]> wrote:

> I sat outside for five hours yesterday morning listening for escaped cats. 
> They know if they get out, that I can't find them if they don't move.  Well, 
> that left me plenty of time to think.  I have never seen one of those key 
> finder things, where you have one device that makes a noise, and a remote 
> that activates it.  So is the receiver to heavy for a cat collar?  Wouldn't 
> the cats be surprised to make noises when they didn't move?  Is this idea 
> pheasible with out being inhumane?
> 
> You know they are sitting stock still a foot and a half out of my reach; 
> laughing their heads off at me.
> 
> 
> H T Kaufman MSW LCSW
> Adaptive Technology Instructor