Dexter is losing his around under his collar. The collar isn't tight enough to cause hair loss and the skin under the collar isn't rubbed raw, red, or has any other sign of irritation. It's just hairless... Any reason for this strange affliction??
Allergy? try a different material.
There's a collar FAQ. It includes photos of my modified Martingale collars. These a reasonably secure, but can be easily slipped on and off. Our dogs don't wear collars indoors, minimizing the collar time. A hazard should they get loose unexpectedly, but they are also chipped.