Microchipping a dog is often recommended as a way to prevent the dog from becoming permanently lost, or for a way to identify the dog if it is stolen. A microchip is a tiny radio transponder which can be implanted by a veterinarian, or a person trained to do so, such as an animal control officer or humane shelter worker. Typically it is inserted in the skin between the shoulder blades. There are some common minor side effects, and a couple of serious, though anecdotal, side effects.
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Pain
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The microchipping process is similar to a vaccination, although the needle is larger. This can cause pain or discomfort in the injection area.
Swelling
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Some swelling can also occur, but should dissipate within a day or two.
Infection
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Although unlikely, a possible side effect of microchipping a dog is infection at the site of implantation.
Blood Loss
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There has been a report of a dog bleeding to death in Los Angeles, where microchipping is mandatory (see Resources).
Cancer
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There also are rare anecdotal reports of dogs developing cancer at the microchip site. According to veterinarian Tracy Dewhirst, writing for the Fox News website, clinical trials show a small percentage of mice developing malignant tumors at their microchip site, but she notes that mice are much smaller in relative size to the microchip (see Resources).
Risks vs. Benefits
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People concerned about the very unlikely potential for a tumor developing at the microchip site must weigh the risk against that of their dog becoming lost. Dewhirst commented that while some people are requesting having microchips removed from their dogs, this procedure requires anesthesia and a deep surgical excision.
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