DAZER ULTRASONIC DOG DETERRENT The DAZER is a hand held ultrasonic dog deterrent useful for anyone who wants to avoid contact with dogs. The DAZER is a humane alternative to sprays and other methods to avoid dog bites. The DAZER emits a high frequency sound heard by dogs and cats, but is harmless and barely perceptible by humans. The DAZERs output startles the approaching dog causing most to stop, move away or stay in place allowing the user to avoid contact with the animal. The DAZER is most effective on unfamiliar and aggressive animals. Use of the DAZER with familiar and passive friendly dogs or your own pet may not evoke a significant reaction. Effectiveness of the DAZER is based on emission of sound and many factors can determine its performance. The distance from the dog, age, temperament and training of the animal can all affect the reaction of the animal.