DEAR DR. FOX: One often-overlooked cause of tachycardia (rapid heart rate) in animals, as well as of other heart arrhythmias and high blood pressure, is wireless radiation in the environment -- or attached to an animal's body, like GPS trackers. This is because the voltage-gated calcium channels (VGCCs) in cell membranes are affected by these … Continue reading Pet Health Concerns: Electronic Devices