The joke say it doesn't matter he won't come anyway. But seriously, what if the dog (or whatever) is really deaf or the handler is mute? Then what? How can you get your pet's attention and alert them to stop or return to you?
About 3 years ago, my friend came to me with this dilemma when Jake, her very old Siberian Husky was loosing his hearing. She usually kept Jake in a large fenced property but when he decided to chase a rabbit, get loose, jump the fence, head onto the roadway, etc. He would be so focused or distracted that no amount of calling would get his attention.
I solved her dilema then with a Deaf Dog Caller Collar. The great thing about this idea is with a bit of training my friend found the dog would at least stop, change focus momentarily, look around for my friend and usually return, even if at his leisure for a treat.
For this Instructable, I built my second unit so it only took me less than 1 hour to locate everything I needed and less than 3 hours to finish the building.
Step 1: Background to the Dog Caller Collar
Further information can be fond at this website DeafDogs.org. They sell manufactured vibrating dog collar units. Some of these units go up to a mile away but you may find this out of your budget. This site also suggests making your own unit much cheaper similar to what I did for this instructable. However they didn't write an instructable for it.
This simple remote control could be slightly modified to control many other applications.
If you build this with a light rather than a vibrating motor you can find your night wandering pet much easier, is just one example.
Note: 'Jake' has since passed and so 'Rusty' has volunteered to model the Deaf Dog Caller Collar. He says, "Please send cookies!"