A system for repelling a pet from at least one predetermined area includes a first device adapted for positioning at the predetermined area. The first device includes at least one of a first receiver and a first transmitter. A second device is adapted for placement on the pet. The second device includes at least one of a second receiver and a second transmitter. At least one of the first device and the second device is configured to warn the pet when the second device approaches the at least one predetermined area, and thereby train the pet to stay away from the predetermined area.