Train Puppies 8 Weeks or Older.
Puppies as young as 8 weeks can be trained for an invisible fence. The owner needs to train the puppy first in basic commands such as sit, stay and down. Once the dog understands basic commands, the owner can begin invisible fence training.
Wait Until Puppies Are 5 to 6 Months.
Training puppies for an invisible fence as early as 8 weeks can cause problems. Dogs go through fearful phases as they mature. Exposing a dog to electronic shock during one of these phases could cause it to want to avoid going outside. Wait until the dog is 5 to 6 months old before training with an invisible fence.
Dogs mature differently and have varying degrees of sensitivity to invisible fences. Dogs that are unsure of themselves and fearful of some normal daily activities should not be trained for an invisible fence until they are 5 to 6 months old. Confident dogs that are sure of their surroundings can be trained earlier. No matter what the age of the dog, be aware of the dog's response and don't force the dog to progress faster than its capabilities.