I'm sure this has come up in previous threads, but I couldn't seem to find anything. I'm wondering if any of you could shed some light on the key characteristics differentiating between a Tovero and Overo. I understand it is (usually?) the result of crossing an Overo with a Tobiano, but when I look at pictures, there are some I would think are Tovero that are classifed as Overo and vice versa. Are there any traits that would make them definitely one or the other, or is it really up to the discretion of the owner?
Just when I think I've got it, I see pictures like the ones below. If I saw that in real life, I'm not sure I would know what the horse is. What would be the difference between the overo on the bottom or middle right and the toveros on the top? Is it really just their genetics? Is it the colour down the back that makes them Overo? Is there anything specifically overoish or toveroish that would be a good indicator? I know I ask a lot of questions on this forum, so I appreciate the time you take for feedback.