Just had a tumor removed from the neck of a 4 year old. Fortunately benign. But what got me was that is right where the e-collar sits. We haven't had to hit him any harder than any other dog, but he has gotten a fair amount of low level taps to remind him to stay in range. Question is has anyone else had this happen or is this just a fluke? A little hesitant to put a collar back on him now, but he is a little headstrong to hunt without.