
We have a 6 year old Rottweiler and a 7 month old Mastador that play roughly. When I got the Ultrasonic Dog Repeller and they played I started on the beep mode and had no effect on their behavior so I tried the Ultrasonic button and they stopped right away. After that, the pup just sat, ears down, scared and cowering for a couple of hours. Please be careful with puppies! I don't have any other reviews as I just got them today and was a bit disappointed with the pup's reaction. Will update later on 8/9/21 after a very frustrating incident with the device, the puppy is 100% back, the vet sees no permanent damage. Customer service was very good and contacted her twice to check on her and address my concerns. I just hope no one else has this problem and I have suggested to customer service that they change the age on the packaging and marketing to over 6 months. If this happens to a large/huge race, I wouldn't want to see a tiny/small race. The product works well on Rottweilers so we only use the lowest settings until the puppy is fully grown.

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