They are used to stop your pets bad behaviour. Say he is barking uncontrollably...you pick up the can, shake it, the noise gets his attention, while saying firmly "no bark". This can be used to stop any unwanted behaviour...it simply makes them stop whatever they are doing wrong...and look to you for guidance. After awhile, supposedly...all you will have to do is pick up the can...then later as they learn "no"...all you have to do is say "no" and they stop.
__________________ As Ever, Kathy 
Intruducing Bentley  Winston and Spencer: RIP My Sweet Angels |