Petsafe YardMax™ Rechargeable In-Ground Fence Add-A-Dog® Extra Receiver Collar - Manual (Page 6)

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These steps will help keep your pet protected and comfortable. Millions
of dogs are comfortable while they wear stainless steel contacts. Some
dogs are sensitive to contact pressure. You may find after some time
that your dog is very tolerant of the collar. If so, you may relax some of
these precautions. It is important to continue daily checks of the contact
area. If redness or sores are found, discontinue use until the skin has
fully healed.
You may need to trim the hair in the area of the Contact Points. Never
shave the dog’s neck; this may lead to a rash or infection.
• The Receiver Collar should not be on your dog when the system is
tested. Your dog may receive an unintended correction.
• The Boundary Width of the system must be tested whenever an
adjustment is made to the Pet Area to prevent unintended corrections
to your dog.
• Do not change transmitter setting from Traditional mode (B) to
YardMax™ mode (A) without verifying that the Receiver Collar will still
contain your pet.
• If you use a collar and leash for training, be sure the extra collar does
not put pressure on the contact points.
• Always remove your dog’s Receiver Collar before performing any
Fence Transmitter testing.
• If possible, DO NOT use an AC circuit protected with a Ground Fault
Circuit Interrupter (GFCI) or Residual Current Device (RCD). In rare
cases, nearby lightning strikes may cause the GFCI or RCD to trip.
Without power your dog may be vulnerable to escape. You will have
to reset the GFCI or RCD to restore power to the system.