Hollowpoint nothing is full proof, but a cheap and effective thing I do is use a bicycle inner tube I cut it long enough that it slides from the box of the collar and all the way over the gps box. Your antenna will also go through it and it hasn’t interrupted signal in any way that we’ve noticed but sure has save some damage to the collar. If it gets cut or torn up you can cut it off and slide another one on. You can get several out of one $12-$15 inner tube.
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