Here is what Badger's skin looked like after he scratch off the sensor. The sensor lasted the entire 14 days with a velcroed wrap around the neck that covered the sensor. After the sensor expired I removed the wrap and tried removing the sensor but it was firmly attached. I used a couple of drops of skin glue to help hold the sensor on. With the wrap removed I went to get some warm soapy water to try to get the sensor off but when I went back Badger already scratched it off.
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Two month later it is hard to tell the sensor was even attached. The fur is almost fully grown back.
I attached a sensor to my foster Wiggles but it only lasted about 9 days. It was attached too far back for the neck wrap of harness to cover so he scratched it off. Very little skin was removed on Wiggles.