Wire Spool from the Dingo Fence

Origins
The Dingo Fence or Dog Fence is a pest-exclusion fence that was built in Australia during the 1880s and finished in 1885, to keep dingoes out of the relatively fertile south-east part of the continent (where they had largely been exterminated) and protect the sheep flocks of southern Queensland. It is one of the longest structures in the world and is the world's longest fence, stretching 5,614 kilometres (3,488 miles). It has been partly successful, though dingoes can still be found in parts of the southern states.

Effects
Wire pulled from the spool has the effect of repelling any form of meat-eating animal. This includes canine, feline, avian and even carnivorous insects. Any animal that is a herbivore will be able to pass unhindered, though they often find themselves accidently damaging or even destroying the barrier accidental. Humans feel no effects of the wire.

The spool seems to have a disproportionate amount of wire on it, and though the mass has decreased over time, it appears to hold a lot more than one would expect. Effects of the wire only last as long as it is strung up as a barrier between two points. If the barrier is physically destroyed or bypassed then, having failed its purpose, the wire loses it's power and becomes ordinary 12.5 gauge farming equipment.

Agents have found that the effect of the wire extends to Felix, and have employed it in some places. Pete and Artie have referred to this as "Felix-proofing" a section.