To us here in the USA who have lived with the song "Dony Gal" and the reality and the mystique of The West, Dony Gal was, and is, the puncher's horse. It refers to the color--and it is an affectionate name for the animal that he spent so very much time with.

VT13090,
Nice choice of a name!!

Also,
you said "She looks 2-ish."

Funny, she doesn't look 2-ish to me!? ;-)