As a person who knows many dog lovers, I know a fellow trainer who also uses ultrasonic devices in order to teach dogs to respond to his commands.
According to him, Instecho Ultrasonic Dog Repellent is another very reliable device whose sound irritates dogs and cats alike, yet it does them no harm.
Although it has a decent range, it works best when you point it towards the animal from some 10-15 feet.
Still, it is highly effective and it is known to eliminate excessive barking and even scare hostile animals in a second. You can also use it during camping trips and night walks because it is waterproof and contains a handy flashlight.
On our list of the best ultrasonic dog repellers Instecho Dog Repellent is ranked in the second position.