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If household power fails, a wireless dog fence may stop transmitting its boundary signal. Unless the exact system has a compatible, working transmitter backup, treat the fence as unavailable for containment and move your dog to a secure physical area or supervise it closely.
What happens to the fence and collar?
Behavior depends on the system. PetSafe manuals for the Free to Roam, PIF-300-21, and Stay + Play wireless fences say the transmitter recognizes a power outage and shuts down without activating the receiver collar. They also warn that a dog near the boundary zone may receive a static correction during the failure. That is not a guarantee that every wireless fence behaves the same way; check the manual for your transmitter and collar.
A mains-powered transmitter without backup cannot be relied on to maintain its boundary while power is out. GPS-based and other battery-powered designs may behave differently; the available manufacturer guidance here does not establish their outage response.
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- Move your dog to secure physical containment. Use a closed room, suitable gate, exercise pen, or another setup appropriate for your dog and home. Supervise your dog until the fence is confirmed to be operating again.
- Check the transmitter and manual. Confirm whether your model supports battery backup and how it indicates an outage. Do not assume that an arbitrary UPS is compatible or that it will provide a particular runtime.
- Keep the receiver collar on only as directed by the manufacturer. PetSafe cautions that a dog near the boundary may receive a correction during an outage. Its manuals also direct owners to remove the collar before deliberately removing power from the transmitter or performing transmitter tests.
- Restore power, then verify operation. Follow the model’s instructions to confirm the transmitter is powered and the system is functioning before relying on it again.
Invisible Fence Brand advises considering alternate containment if an outage lasts an hour or more. That is the company’s guidance for its system, not a universal cutoff for other fences.
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Backup power and outage alarms are model-specific
Some systems offer an optional transmitter battery backup. PetSafe suggests considering a backup device for its PIF-300-21 system in areas with frequent power cuts; Invisible Fence Brand says its outdoor system can continue operating during a power failure with its optional backup battery. Neither source establishes a universal backup unit, electrical compatibility list, or runtime. Check the exact transmitter manual and backup specifications before connecting equipment.
Alarm duration is not backup runtime. The PetSafe Free to Roam manual says its transmitter sounds an intermittent alarm for more than 20 minutes during an outage; the Stay + Play manual gives up to 30 minutes. Those figures describe the alerts for those models, not how long a battery can keep a fence running.
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Do not confuse a collar battery problem with an outage
A receiver collar that will not power on may need model-specific charging or battery troubleshooting. PetSafe support gives those checks for named collar models, but replacing or charging a collar battery does not restore a transmitter’s boundary signal when household power is out. Diagnose the collar and transmitter as separate parts of the system.
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