We have an 8 year old female lab. She has been exposed to an invisible fence her entire life. When we moved to The Villages 3+ years ago we had a dog watch fence installed. After learning the boundaries she had not left our yard until last week. She followed my wife down the driveway and into the street. That was a surprise to both of us! Guess it was time to change the battery in her collar! Our fence emits a tone before the shock if the dog gets to close to the boundary. When she hears the tone she will back off.
With proper training, I think invisible fences are an acceptable solution to not having a physical fence. If you install one, be sure to let your lawn service know if they plan to aerate your yard!
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The difference between genius and stupidity is genius has its limits - Albert Einstein
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