That makes sense. None of our 3 cotons bit our ankles. When I lost my coton, my family bought me a Havanese, which are very similar to Cotons. He was an ankle biter, but it stopped when he was somewhere around one year old. I don’t think Havanese are herders, but I should look up each of the breeds that they are a mix of.
He was very hyper. The first year felt like living in a whirlwind. We noticed that food affected him, and finally got him on a fish based chow mixed with cooked white fish, and it has helped a lot.