I had tried the regular type of fly boots for my Standard Donkey, but I couldn't get them to fit properly. They were too wide and I had to sew them up. But even when I did that, they'd still fall down around his hooves. And with him rolling around in the dirt all the time, they got really beat up and the velcro stopped working properly. But this design of fly boots for my donkey is PERFECT! They stay up and don't fall down over his hooves. I got the Pony size, which works well, but I'd like to submit a suggestion: Would you consider offering a "donkey size" and making them one inch longer. Right now, they fall a few inches below his knees. I'd really like them to be about one inch higher. Other than that, I LOVE THESE BOOTS!!!