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What your system is trying to tell you.

Invisible Fence® not working? Start here.

Every symptom points somewhere specific, whether that’s a beeping transmitter, a collar that stays silent, or a dog who suddenly ignores the line. This guide covers the six most common ones: what each usually means, what you can safely check yourself, and when it’s time to call.

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The one rule that comes before every fix: whenever the system is down (a beeping transmitter, a dead collar, a power outage), treat your yard as an unfenced yard. Leash walks and supervised time only, until the boundary passes a test again. Every section below assumes you’ve done this first.

Symptom 1

The transmitter is beeping.

The wall unit’s alarm is a loop monitor: it sounds when the electrical circuit through your buried wire is interrupted or degraded. It’s annoying by design, because it means the boundary is not protecting your dog right now.

Likely causes

  • A complete wire break somewhere in the loop (the most common cause by a wide margin)
  • Partial wire damage or failing insulation degrading the circuit
  • A loose or corroded wire connection at the transmitter terminals
  • A transmitter fault or unstable power at the outlet

What you can safely check yourself

  • Confirm the outlet has steady power by testing it with another device.
  • Check that both boundary-wire leads are seated firmly in the transmitter terminals.
  • Think about recent ground work: aeration, new landscaping, utility repairs, mailbox or fence posts, edging. A fresh dig is the number-one wire-break suspect.
  • Power-cycle the unit once. If the beep returns, stop there, because more resets won’t help.

When to call

If the beep persists after those checks, it’s almost always a wire break. Finding one takes locating equipment, which is what the next section covers.

Symptom 2

Finding a dog fence wire break.

Somewhere in hundreds (sometimes thousands) of feet of buried wire, the circuit is broken. The symptom is the beeping transmitter above; the fix is locating one fault you cannot see from the surface.

Why guess-digging fails

A break is invisible from above: the lawn looks identical over good wire and bad. Worse, many “breaks” aren’t clean cuts at all but a nick in the insulation or a corroded old splice, so even digging up the right spot can look like nothing is wrong. Every exploratory hole also risks damaging healthy wire, turning one fault into several. Owners who start digging on a hunch usually end up with a torn-up lawn and the same beeping transmitter.

How wire-break locating works

We put a traceable locating signal on your boundary wire, then sweep the loop with a receiver that reads that signal through the soil. The fault is where the signal changes, and we can usually pinpoint it within a small area. One small hole, a waterproof splice, a full-loop retest, and the transmitter goes quiet. Most locates and repairs are finished in a single visit.

See the wire-break repair service. It works on any brand’s buried wire, regardless of who installed it.

A black Labrador sitting attentively in tall grass

Symptoms 3 to 6

Four more electric dog fence symptoms worth decoding.

Dog fence collar not activating

Symptom

Your dog walks up to the boundary, or straight through it, and the collar gives no warning tone and no correction.

Likely causes

  • Dead or dying receiver battery (by far the most common cause)
  • Collar fitted too loosely, so the contact points don't reach the skin
  • Contact points blocked by a thick or matted coat, or fouled with debris
  • Receiver programmed to the wrong setting, or an internal receiver fault

What you can safely check yourself

  • Replace the battery first. The receiver takes a battery, not a charge. That resolves most silent collars.
  • Check the fit: snug enough that the contact points touch skin, with room to slide two fingers underneath.
  • Clean the contact points and clear hair from around them.
  • Hold the collar at your dog's neck height (dog elsewhere) and walk toward the flags, listening for the warning tone.

When to call

If you have a fresh battery, a good fit, and clean contacts and still get nothing at the boundary, the receiver needs bench testing. We diagnose it and, if it's done, explain compatible replacement options rather than pushing a whole new system.

Boundary inconsistent

Symptom

The warning zone feels wider some days than others, or your dog gets a warning in the middle of the yard, nowhere near the wire.

Likely causes

  • Signal-width setting changed on the transmitter, sometimes just a bumped dial
  • Interference from large metal objects, appliances, or another buried wire nearby
  • Sections of the loop routed too close together, cancelling or distorting the signal
  • Partial wire damage that weakens the signal on part of the loop

What you can safely check yourself

  • Note where and when it happens. A pattern is the most useful thing you can hand a technician.
  • Check whether the transmitter's boundary-width control has been moved.
  • Think about what changed recently: new equipment in the garage, new wiring, a neighbor's new system.

When to call

Interference and partial damage are meter work. We walk the loop, map the signal field, and fix the cause instead of turning the width up to mask it.

After a power outage

Symptom

Power is back, but the transmitter display looks unfamiliar, the system seems off, or you're just not sure the boundary is live again.

Likely causes

  • Transmitter didn't restart cleanly when power returned
  • Settings reset or partially reset by the interruption
  • A surge rode in with the outage or the restoration and stressed the electronics

What you can safely check yourself

  • Confirm the transmitter's lights and display match its normal operating state.
  • Test the boundary: hold the collar at neck height and walk toward the flags, listening for the tone.
  • Keep your dog leashed or supervised until the walk test passes. During any outage, the yard is unfenced.

When to call

Anything unfamiliar on the display, or a boundary that fails the walk test after a restart, is worth a diagnostic. Outage-related faults tend to get worse rather than better.

After lightning

Symptom

After a storm, the transmitter is dead, beeping, or behaving erratically. Maybe a breaker tripped, or there's a faint burnt smell near the unit.

Likely causes

  • Surge through the power line (lightning doesn't need a direct hit to damage the transmitter)
  • Surge induced onto the buried loop itself by a nearby strike
  • Partial damage: a system that seems fine but has a weakened transmitter or stressed wire insulation

What you can safely check yourself

  • Safe visual checks only: the breaker, the outlet, and the indicator lights. Never open the transmitter housing.
  • If the unit is dead or erratic, unplug it and treat the yard as unfenced.

When to call

Always, after a suspected strike. Surge damage is often partial and invisible, so a boundary that works today can fail weeks later. We test the electronics and the full loop, and our installations include surge protection so the next storm is less likely to matter.

Invisible Fence still not working after these checks?

That’s what the diagnostic visit is for. We test the transmitter, the collar, and the full loop on any brand’s system, regardless of who installed it, then tell you what’s wrong and fix most problems in the same visit. Until then, remember the rule: system down means the yard is unfenced.

Book a diagnosticWire-break repairCall or text 804-432-1777

Repair questions

Common dog fence repair questions.

Can you repair an existing Invisible Fence® system?

Yes. We diagnose and repair systems from Invisible Fence®, Dog Guard®, DogWatch®, Pet Stop®, PetSafe®, SportDOG® and others, regardless of who installed them. Wire breaks, transmitter faults, and collar issues are all common, fixable problems.

What happens during a power outage?

The boundary is inactive while power is out, so treat the yard like an unfenced yard until it's restored. We'll explain backup options and what to watch for when power returns.

What happens if the wire breaks?

The transmitter alerts you (typically with a beep or indicator light) and the boundary stops correcting until the break is fixed. We locate breaks with specialized equipment and splice them with waterproof connectors, which is usually a same-visit repair.

Ready for a fix? Start with the repair service or go straight to wire-break repair.

Get it diagnosed instead of guessing.

Tell us what the system is doing: beeping, a silent collar, a boundary that comes and goes. We'll tell you the likely cause and the fastest path to a working fence.

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