Phebe measures in at 17" exactly, so she's jumping 16" in AKC (in a couple of weeks). If I decide to try USDAA (there's a local trial in November), then we'll probably enter the Preferred classes, so that she can still jump 16". I think she could handle the 22", but I think it's just too high. I don't understand why USDAA jump heights leap from 16" to 22" in the championship classes.
