[Wylie's Mom]

I talked to a trainer yesterday at the shelter where I volunteer and asked her about these ultrasonic devices. She likened the effect of the sound to fingernails on a chalkboard -- to some people, this sound is horrible and it bugs them - to others, no real effect. She said it'd be the same with this ultrasonic sound for dogs.

She said we should always be very careful when using it, most especially on a group of dogs bc you could be "punishing" all the dogs, when really only one dog is doing something wrong -- so it can be very confusing for the dog who wasn't doing anything. She said you can also end up decreasing "good" behavior if it's not used properly.