Thank you for your input! I agree that she is still on the young side and I will go ahead and enter preferred. For the record we only jump 4 inches high during majority of the training classes, so I don't feel that I've put her body at risk during that time. I really would like to get her entered at a real trial for the experience. I run agility with my other dog and her first couple trails there was a lot of getting used to the atmosphere and I would like to get my boxer familiar with that ASAP. I'm certainly not going to be pushing her for her fasted time, I'm just going to make the whole day a positive experience
I've taken her to trails with my other dog but its not quite the same as getting out in the ring. What she measures would put her in the 20 inch category, and I agree that is way too high for her being less than 2 years old. We'll probably only have a chance to enter 2-3 trails this spring, and then will take the summer off until the fall when she'll be two. Thanks again!