I recently noticed a dark brown spot on the inside of Adrina's foreleg. Upon closer examination, I noted it was dark brown hair or wound hair.
The hairs are currently about 3/4" long and are the color of Adrina's puppy coat. This is a first on one of my Lagotti but I have seen it many times on the light honey color of Wheaten Terriers.
I did not notice Adrina having a sore on her leg and she did not seem to lick it excessively so I can only assume she had a bug bite or some abrasion causing her hair to revert to puppy coat in that spot. I searched the internet, without success, for a more technical explanation of the process that creates wound hair and why it comes in as puppy color then grows back to adult color after about 6 months. Lacking a medical explanation, I will mention a couple of experiences I have had.
The Wheaten Terrier wound hair grows in a dark red or mahogany, similar to puppy coat and which shows up easily on the blonde coat. Hot spots, surgery and other abrasions are the cause. My last Wheaten had a digestive melt-down and we almost lost her. Her hair started falling out each time I combed her. Once we were able to stabilize her, I noticed new hair all over her body coming in red. After a bit, I realized this was wound hair and as it grew in, she had a reddish cast to her coat which lasted until I later trimmed it off.
It seems the dog's skin doesn't appear to scar, so the damage or changes occur (IMHO) in the hair follicles, where the dog's body sends a message to revert to puppy coat for a period of time.
I will try to post an updated photo once the hairs start to grow out. Currently they are brown to the base.