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Title: Doesn't work on Mastiff or Rottie
Review: I was disappointed because there were so many good things said about this product. I have a well socialized Mastiff and Rottie. I would say they get along 95% of the time but sometimes when we give them attention, they sniff each other and begin to fight. I thought this little device would work but it didn't faze them one bit. I did find something that does work do divert their attention away from fighting. I got a big medal pot top and a metal spoon. When they begin to approach each other like they are going to fight, I bang the spoon on the pot top and they stop in their tracks and totally avoid each other, within a few seconds they forget and all is well in the yard. It even startles me at times but no more fights. No more leadership issues anymore and it's a cheap solution.
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