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does this work for 2 dogs?

depends on proximity of dogs. When I stop my dog from reacting to another dog both dogs look at the source of the noise. Some of my neighbors think it is cruel but most of my neighbors are appreciative of the fact that he no longer barks at bikes, golf carts, joggers, and cars. He sees the device in my hand and does not need to hear the sound to be quiet when the fearsome items enter his world. I also reward him with a "good boy" and I attached a word to the sound as I pressed the button.

Whats the difference between this device and the other modus device

Modus has two models only, handheld and automatic. This is the latest model of the handheld device. You could also know more detail from our brand store: https://www.amazon.com/stores/node/20693347011?_encoding=UTF8&field-lbr_brands_browse-bin=MODUS&ref_=bl_dp_s_web_20693347011

Can i use this to deter other dogs from attacking me and my dog? i live in a neighborhood where loose dogs reign and its quite dangerous. thank you

It won’t stop a dangerous dog from attacking you. Here is how it works for me. Mind you, I have a toy poodle. He barks at something, I say no, sometimes he stops. When he doesn’t, I press the button on this and it immediately grabs his attention. Sometimes it takes three attention grabs for him to stop barking. It basically snaps him out of it. Glean from that information what you can. I would never send a person out into dangerous dogs with this.