Why Is There a Magnet Inside My Dog?

Pet trackers, and lots of other electronics, have little cylinders inside them called ferrite beads. If they didn’t, they’d probably be picking up the local traffic report instead.

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Sources:
http://www.radio-electronics.com/info/data/inductors/ferrite-bead-inductors.php
http://audiosystemsgroup.com/SAC0305Ferrites.pdf
http://www.vishay.com/docs/ilb_ilbb_enote.pdf
https://www.futureelectronics.com/en/filters/ferrite-beads.aspx
http://www.digikey.com/Web%20Export/Supplier%20Content/TDK_445/PDF/TDK_InCompliance_Aug2010.pdf
http://www.radio-electronics.com/info/circuits/emc-emi/electromagnetic-interference-basics-tutorial.php
http://www.corerfid.com/technology/TechnologyIssues/IssuesInterference.aspx