Help with horses

I'm writing a story in which some horsey types have a brief conversation about matters equine, and I would appreciate help because I know nothing.

If anyone who knows about these things would answer a few questions that would be very helpful. Please send me pop up if you would be so gracious.

Ta, O.

Hmmmm.... I'm not a expert by any means, but my daughter used to ride for a little while. I can try to help.

Thanks to those who have offered their help. I have now received answers to the questions that I had.