There are a lot of reasons a dog may break his fence boundary. The first thing I would look at is the dog fence collar. Is the battery good, most batteries are good for four months give or take. Some electronic collars malfunction and will start to eat the battery as soon as two days after it has Benn installed.
In the case the dog fence collar is killing the battery you should contact your local office. Most professional pet systems will have a local office. If there is no local office contact the manufacturer. After you verify the underground invisible dog fence has a good battery check the fit. The fence collar should not be loose both metal posts must make contact with the dogs skin. Thick hair may also prevent contact if that is the case you may need to thin the neck area out a little.
Ok you have checked all that and the dog escapes. Most underground dog fence systems has two adjustments. First is the signal field adjustment, if this is to small most dogs can run out in many cases with out a correction at all. Most dog fence systems have a short delay and if your fence transmitter is only set up to a two foot signal field it needs to be turned up. I would suggest at least six feet on a average size property of a half acre. If there is two or more acres fenced then there is no reason not to have at least a ten foot signal field.
Next is the underground invisible dog fence receiver. Most fence systems can be adjusted for a stronger correction. This means a stronger shock and removing the delay. Some containment systems will have a adjustment on the transmitter or the fence receiver itself. See owners manual for your brand they are all a little different. Invisible dog fence brand is not adjustable by the transmitter or on the receiver you will need to have a tech come out or visit the local office.
If the dog is still leaving the containment area after these adjustments find out where. Most dogs will leave the fence area in the same spot, the driveway is the common. I have found that a tie out in the area where your dog is leaving is very affective. For a period of about two weeks tie the dog out with the fence receiver on. Leave the slack in the tie out long enough to almost get out of the containment area but not all the way out. I know you got the fence so you don’t have to use a tie out but a couple of weeks of this is what I have found to be the most affective to break the dogs bad habit and keep your pet at home.
Thanks for reading from the dog fence pro. Visit my blog for more dog fence installation, repair or training tips. http://www.dogguardnorthwest.com/dog-fence-repair-tips.php