If the dog associates the zap with his actions at the time, there is a chance he may stop giving warning as he approaches the perimeter. Now you have a dog that gives no warning signs before reacting. This is a very dangerous animal, as humans have no way of knowing its intent through body language. An invisible fence is indiscriminant in when it punishes and does not learn how to manage a dog humanely: it just responds to the proximity of the electric collar.
I have worked with dogs that have developed fears of being on grass because they associated the shock with grass. Now these dogs are having issues as they refuse to potty on grass and are using decks, patios and even indoors as their potty spots.
Lastly, how cheap are these fences? Veterinary bills and/or a lawsuit can be far more costly than a good, barrier fence or secure dog kennel. Is the lack of security an electric fence provides worth saving a few bucks? Is it worth risking the chance that your dog may be the one to develop behavioral issues? It is far easier to work to prevent undesired behaviors than fix them later on.
In 22 plus years of working with dogs, I do not feel that invisible fences are a safe, humane or fair method of primary confinement for dogs. This type of fencing offers no protection to the dog and minimal protection from the dog to the general public. There are also behavioral issues that can arise through the use of these fences. Sadly, until one has been employed, there is no way of knowing how the dog will react over time to the fence. The safest form of confining dog to the property for its own protection and mental well-being as well as the protection of others is a good, physical, barrier fence. |