Posted: 12/09/2017 at 18:00
When they retired my parents lived for some years on the Suffolk coast and walked their dogs on the surrounding heaths ... I recall one of their dogs suffering badly from what the vet diagnosed as mites one year ... if I remember correctly the problem was said to be an allergic reaction to the bites ... I think my parents said they'd been told that some dogs suffer badly, others don't seem to be affected.
Certainly my parents never said they'd been bitten themselves.
Hope you can sort something out.