We have never had anything come through out doggie door, either. Just because we haven't had anything come through so far....it is always a possibility.
Also, we did have a dog who would not stop when wearing a shock collar. It would probably depend upon the type of dog you have. Ours had a strong prey drive. He wanted to chase things....no matter what. Either way...I would not fully trust the invisible fence. It might be fine if you are there to supervise, but I wouldn't take the chance of leaving my dog out there by him/herself. Again, I think it depends on the dog.
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