How Much to Charge?

I’ve opened my home up to them and gave them a good deal for an hour or two of yard work 2 days a week. They were in a pinch and I stepped in. Just today he tried to strike out at me when preparing his feed, now that he’s feeling so much better and his hoof doesn’t hurt, he’s getting a little too big for his britches. I’ve taken to arming myself with a broom to keep him back.