Patento Pet USA presents the Dog-e-Walk, an all-in-one trainer that uses an ultrasonic signal to stop leash pulling and end problem behaviors, the company reports. The trainer attaches between the collar and the lead and when a dog starts to pull, a high-frequency ultrasonic tone—audible only to dogs—will sound. The harder a dog pulls, the louder the signal becomes. The harmless signal refocuses a dog's attention and helps to discourage bad behavior; and with regular use, a dog should stop pulling completely, according to the manufacturer. The trainer can also be used as a remote training device that's great for agility or dog school training, the company adds.