Iron Dobbin is not a thing that exists in real life, but it could be a made-up name for a toy or a character in a story. If we imagine that Iron Dobbin is a toy, it might be a little metal horse that you can ride around or play with like a regular toy horse. The name Iron might make us think that it's very strong or sturdy, like it won't break easily. Dobbin could be another word for horse, so maybe that's why it's called Iron Dobbin.
If we imagine that Iron Dobbin is a character in a story, it might be a horse that has special powers or abilities. Maybe Iron Dobbin can run really fast, jump really high, or talk to other animals. Iron might make us think that it's a magical horse made of metal or some kind of enchanted creature, so it would be very unique and special.
Overall, Iron Dobbin is just a name that could apply to anything really, but it's likely to be a toy or character that involves a horse-like creature that has some sort of special qualities or abilities.