I've done a lot of reading about animals ‘self-medicate’, searching out certain plants, herbs, shrubs and trees to treat specific ailments or nutritional deficiencies. It is really fascinating and has been observed and documented for centuries. People who have pasture animals (horses, cows, goats, etc.) have noted again and again how they will instinctively seek out what they need. For example, I read that " ... immediately before and after calving cows seek out nettles as a readily available source of iron; docks, normally ruthlessly sprayed out as a sign of an ‘untidy’ pasture, are selected by animals needing a boost in minerals or trace elements such as copper, and animals that have bruised or strained muscles in a fall or during horse-play will eat willow leaves: their equivalent of knocking back a couple of aspirin. "
Many natural remedy formulas were put together based on these observations over the years. Cool, huh?